OEM ODM Butterfly Enamel Custom Metal Bookmark

Precious butterfly bookmark with gift box

Manufacturer & Factory Direct Custom Metal Bookmarks

Description :

Ultra-thin 0.35 mm profile with zero spine swelling. Precision photochemical etching shapes high-purity H65 brass or SUS304 stainless steel down to a featherlight 0.35 mm thickness (±0.02 mm tolerance). Slides between delicate pages without stretching stitched bindings, warping hardcover spines, or leaving permanent page indentations.
Hairline 0.12 mm etching resolution with burr-free edges. Dual-sided chemical milling resolves intricate botanic veins, architectural filigree, and corporate insignias down to 0.12 mm aperture widths. Followed by 45-minute micro-magnetic deburring (R ≥ 0.05 mm corner radiusing) that guarantees snag-free gliding across Bible paper and antique volumes.
Certified lead-free metallurgy with nano-sealed anti-tarnish luster. Formulated strictly from certified lead-free H65 brass (Pb < 90 ppm, CPSIA / California Proposition 65 compliant). Sealed beneath an 8-12 μm baked acrylic nano-coat that shields warm 24K gold and antique bronze electroplating against fingerprint oils and oxidation through 48h salt-spray testing.

Base Metallurgy	Certified lead-free H65 brass (Cu 63.5-66.5%) or austenitic SUS304 stainless steel
Core Sheet Thickness	Standard 0.35 mm (±0.02 mm); optional 0.25 mm ultra-thin or 0.50 mm stiffened profile
Chemical Etching Precision	Dual-sided photochemical milling down to 0.12 mm minimum aperture / line width
Edge Safety Finishing	45-min magnetic tumbling deburring; micro-radiused R ≥ 0.05 mm paper-safe corners
Hanging Attachments	120 mm anti-static ice-silk tassel, braided cord, or 0.25 mm metal chain with mini charm
Production Turnaround	Vector artwork proof: 2-4 working hours \| Samples: 3-5 working days \| Mass run: 10-14 working days

Submit your museum motif, literary crest, or vector artwork (.AI, .EPS, .PDF or .SVG) for a factory-direct quotation and a complimentary 2D/3D etching layout proof within 2 to 4 working hours.

Chat Now Message Email

Product Description:

Product Specifications & Custom Craftsmanship Overview

Specification & Benchmark	Gold Valley Direct-Factory Standard
Base Metallurgy Grade	Certified Lead-Free H65 Brass (C26800, Cu 65%, Pb < 90 ppm) or SUS304 Stainless Steel Explore Custom Metal Bookmarks
Standard Sheet Thickness	0.35 mm ± 0.02 mm (optional 0.25 mm ultra-flex or 0.50 mm rigid structural grade)
Chemical Etching Resolution	Dual-sided photochemical etching down to 0.12 mm (120 μm) minimum slot & bridge width
Surface Deburring & Radiusing	45-minute centrifugal magnetic bead polishing; edge chamfering radius R ≥ 0.05 mm
Decorative Electroplating Options	24K flash gold, specular silver, rose gold, antique bronze, antique copper, or raw brushed SUS304
Protective Clear Sealing	Electrostatic baked nano acrylic lacquer (8-12 μm, 3H pencil hardness, anti-fingerprint)
Standard Dimensional Envelopes	50 × 80 mm, 60 × 60 mm round, 40 × 120 mm elongated, or fully bespoke contour cutouts
Hanging Tassel & Charms	120 mm anti-static synthetic ice-silk tassel, woven metallic cord, or miniature 2D/3D pendant
Accelerated Corrosion Resistance	48-hour Neutral Salt Spray (ASTM B117 / ISO 9227) with zero surface greening or pitting
Environmental & Safety Mandates	California Proposition 65 (total Pb < 90 ppm, total Cd < 100 ppm); CPSIA 2008; EU REACH Annex XVII

0.35mm Photo-Etched Brass or Die-Cast 3D Zinc Top-Spine Bookmark?

Selecting between an ultra-thin photo-etched brass bookmark and a sculpted die-cast 3D top-spine bookmark depends on reader ergonomics, retail packaging format, and artistic detail density.

• 0.35mm Photo-Etched Brass (Flat Filigree Heritage)

Best for: Museum gift stores, literary publishing houses, botanical society gifts, academic anniversary keepsakes, and flat postal mailing packages requiring zero book spine bulge.

Spine-Safe Ultra-Thin Profile: At just 0.35 mm thickness, the bookmark nests completely flush between paper sheets. Closes heavy hardcovers without prying open binding stitches or cracking spine glue.
Micro-Lace Filigree Fidelity: Dual-sided photochemical milling achieves delicate 0.12 mm fretwork lines that capture leaf venation, Islamic geometric tiles, and fine typographical scripts impossible with casting molds.
Postal Mailer Compatibility: Flat geometry slips easily into standard postal greeting card envelopes or retail blister sleeves with minimal shipping bulk, reducing international fulfillment overhead.

• Die-Cast 3D Zinc Alloy Bookmark (Sculptural Shelf Presence)

Best for: Fantasy gaming merchandise, luxury hotel desk stationery, pop-culture comic conventions, and executive leather journal sets where sculptural 3D relief is desired.

3D Sculpted Finial Presence: Features a heavy dimensional crest (3.0 mm to 6.0 mm thick) that rests prominently above the closed book spine, serving as an ornate visual bookend on library shelves.
Heavyweight Handfeel: Solid zinc alloy construction delivers a substantial 40g to 75g tactile presence in hand, paired with an integrated 10 cm ruler scale along the stamped metal stem.
Rigid Stem Clearance: Requires thicker paper stock or loose-leaf journal bindings to accommodate the 1.2 mm to 1.5 mm insertion blade. To review matching desktop accessories, explore our Explore Custom Metal Keychains.

💡 Practical Craft Selection Tip: 💡 Factory Sourcing Rule of Thumb: For mass bookstore promotions, museum gift shops, and delicate reader volumes where page protection is mandatory, choose 0.35mm photo-etched brass. For collector gaming editions or heavy desktop bibles where the emblem rests outside the closed pages, select 3D die-cast top-spine bookmarks.

Precision Etching Mechanics & Surface Integrity Architecture

A premium metal bookmark must never scratch fragile book stock, snag reader fingers, or oxidize under humid library atmospheres. We engineer tactile safety and visual precision into every chemical and mechanical process.

Dual-Sided Photochemical Milling

0.12 mm hairline apertures

High-resolution graphic artwork is imaged onto dry-film photoresist on both brass faces. Controlled chemical spray dissolves unmasked metal from both directions simultaneously, forming crisp filigree windows down to 0.12 mm width without mechanical punch distortion.

Magnetic Bead Edge Radiusing

Zero paper-cut assurance

After chemical cutout, flat sheets undergo 45 minutes in a high-speed centrifugal magnetic finishing barrel. Millions of micro-fine stainless steel pins gently radius all exterior and interior perimeter edges to R ≥ 0.05 mm, eliminating sharp burrs that tear delicate Bible paper.

Certified Lead-Free H65 Brass

Pb < 90 ppm CPSIA compliance

We roll exclusively from certified H65 copper alloy (Cu 63.5-66.5%, balance Zn) strictly audited for total lead content under 90 ppm. Eliminates toxic lead leaching common in industrial free-cutting brass, satisfying USA CPSIA and California Proposition 65 toy and stationery safety limits.

Anti-Static Ice-Silk Tassel

Kink-free fluid drape

Hanging pendants feature dense 120 mm synthetic ice-silk tassels treated with anti-static silicone conditioners. Resists humidity frizz, stays silky straight, and drapes gracefully over book margins without tangling or fraying during extended use.

Baked Nano-Acrylic Sealing

48h salt spray resistance

Electroplated gold, silver, and antique bronze surfaces receive an automated electrostatic coat of optical-clear acrylic baking lacquer (8-12 μm, 3H pencil hardness). Creates a durable barrier against acidic skin oils and moisture, preventing greening and tarnish.

Selective Color Infill & Printing

Vibrant multi-tone accents

Recessed etching cavities can receive vibrant soft enamel color infills or UV silkscreen printing. Sealed under crystal-clear UV jeweler resin or baked flat to accentuate heraldic shields, floral petals, and corporate brand palettes.

Jewelry-Grade Plating & Classical Patina Finishes

Surface coloration elevates brass etching into a refined keepsake. Each finish undergoes multi-stage electrolytic bath conditioning and transparent protective sealing.

Process / Effect	Technical Formulation & Appearance	Best Applications
Specular 24K Gold Rack Plating	Cyanide copper leveling followed by bright nickel and 24K real gold electrodeposition. Yields a radiant, mirror-reflective golden sheen that mimics illuminated medieval manuscripts under reading lamps.	High-end publishing jubilees, luxury museum stores, university convocation gifts
Hand-Relieved Antique Bronze & Antique Copper	Brass sheets undergo chemical sulfur immersion to create a deep dark patina, followed by hand-buffing across raised textures. Recessed lace cavities remain dark while high edges gleam with warm vintage tones.	Historic preservation societies, botanical heritage collections, vintage bookshops
Brushed Stainless Steel Natural Luster	Austenitic SUS304 sheet chemically milled and directional wire-brushed for a crisp, contemporary satin reflection. Inherently rust-proof with zero electroplated layers, ideal for modern minimalist stationery lines.	Contemporary architecture firms, technology corporate gift sets, minimalist journals
Rose Gold & Specular Rhodium/Silver	Delicate copper-gold alloy or specular white rhodium electroplated over high-purity nickel barriers. Delivers chic feminine warmth or cool platinum brilliance popular in fashion and bridal literature merchandise.	Romance literature box sets, boutique bridal keepsakes, lifestyle influencer stationery

For complete electroplating bath specifications, coating thickness standards, and salt spray test documentation, review our Industrial Electroplating & Finishes Standard.

Literary Presentation & Retail Merchandise Packaging

From protective bulk distribution sleeves to premium boxed presentation portfolios, our packaging formats protect delicate filigree and enhance perceived retail value.

Clear Poly Sleeve with Printed Backer Card (Included Default)
300g white art paper backing card printed in full-color CMYK with custom bookmark holding slits, sealed inside an optical-clear polypropylene pouch with Euro-slot retail hang hole.

Foil-Stamped Textured Paper Folder (Literary Elegance Upgrade)
350g black or kraft textured cardstock folder with gold metallic hot-stamped cover graphics and interior die-cut corner notches to secure the bookmark and tassel.

Clear Window Presentation Tin Box (Boutique Gift Upgrade)
Seamless brushed tinplate container with clear optical PVC display lid and precision die-cut black EVA foam tray that holds the metal bookmark and tassel securely during postal fulfillment.

Rigid Clamshell Presentation Box with Velvet Insert (Executive Keepsake Upgrade)
Heavy 1000g rigid greyboard box wrapped in specialty book cloth, featuring magnetic closure lid and high-density velour-flocked tray for university convocation and VIP presentation gifts.

Photochemical Tooling, Etching & Edge Deburring Operations

1. Phototool Vector Plotting	CAD engineering drafts are translated into high-density 12,000 DPI photographic film masks, precisely compensating for chemical etch factors to maintain 0.12 mm filigree precision.
2. Pre-Clean & Dry-Film Photoresist Lamination	H65 brass or SUS304 sheets pass through acid degreasing and micro-etching rollers before undergoing vacuum thermal lamination with UV-sensitive dry photopolymer resist.
3. Double-Sided UV Contact Exposure	Laser-aligned dual exposure units transfer vector patterns onto both sides of the sheet simultaneously, hardening exposed artwork areas under collimated UV wavelengths.
4. Conveyorized Chemical Spray Etching	Sheets travel through automated horizontal chambers where ferric chloride etchant dissolves unmasked metal under monitored temperature and Baumé density controls.
5. Centrifugal Magnetic Bead Deburring	Extracted bookmark frets enter magnetic tumbling barrels with sub-millimeter stainless steel media for 45 minutes, radiusing every aperture edge to R ≥ 0.05 mm smooth safety.
6. Electroplating, Lacquer Seal & Tassel Assembly	Cleaned frets receive 24K gold, antique bronze, or chrome plating, followed by baked acrylic nano-lacquer curing, optical inspection, and hand-attachment of silk tassels.

Factory Assurance: Chemical etching precision, edge safety radiusing, and lead-free compliance are audited under the direction of Senior Tooling Engineer Lin Jianhua (Gold Valley Dongguan Works). Our manufacturing operations conform to ISO 9001:2015 quality guidelines, annual Sedex SMETA 4-Pillar ethical manufacturing audits, and full compliance with California Proposition 65, CPSIA 2008, and EU REACH Annex XVII safety directives.

[RFQ] Sourcing Spec Sheet (Copy-Paste for Your RFQ)

Paste the parameter table below straight into your request for quotation, or forward directly to our Direct Engineering Desk for an itemized factory quotation within 2 to 4 working hours:

• Product Morphology: Ultra-thin photo-etched metal bookmark with hanging tassel or clip

• Base Metallurgy: Certified Lead-Free H65 Brass (Cu 63.5-66.5%, Pb < 90 ppm) or SUS304 Stainless Steel

• Core Sheet Thickness: Standard 0.35 mm ± 0.02 mm (optional 0.25 mm ultra-thin or 0.50 mm rigid grade)

• Chemical Etching Resolution: Dual-sided photochemical milling down to 0.12 mm (120 μm) minimum aperture width

• Edge Safety Benchmark: 45-min centrifugal magnetic bead deburring; corner edge radiusing R ≥ 0.05 mm (paper-safe)

• Decorative Finishes: 24K real gold rack plating, specular silver, rose gold, antique bronze; baked acrylic nano-seal (3H)

• Hanging Attachment: 120 mm anti-static ice-silk tassel, woven metallic cord, or miniature 2D/3D pendant charm

• International Compliance: California Proposition 65 (total Pb < 90 ppm, total Cd < 100 ppm); CPSIA 2008; EU REACH EN 1811:2023

(Engineered to Gold Valley Factory Tolerances — Dongguan Facility)

Custom Metal Bookmarks: Ordering & Engineering FAQ

Will the thin metal edges tear delicate book pages or cut readers’ fingers?

A: No. Rough edges occur when bookmarks are stamped on mechanical punch dies or cut with high-heat lasers that produce jagged burrs and melted slag. Gold Valley uses gentle chemical spray etching that dissolves metal at room temperature, followed by 45 minutes in a centrifugal magnetic deburring barrel. Millions of micro-pins polish every internal filigree aperture and perimeter border to a smooth radius of R ≥ 0.05 mm, ensuring the bookmark glides over thin Bible paper with zero snagging.

Does inserting this metal bookmark warp hardcover book spines or stretch binding glue?

A: No. We engineer our standard bookmarks to an ultra-thin 0.35 mm gauge (roughly the thickness of three standard book pages). Unlike thick cast alloy novelties (1.5 mm to 3.0 mm) that pry bindings open, our 0.35 mm photo-etched brass rests completely flat between closed pages, leaving zero permanent indentations on paper and causing zero strain on sewn book spines.

How does Gold Valley prevent brass bookmarks from tarnishing and turning green over time?

A: Raw brass naturally oxidizes when exposed to moisture and human finger oils. To prevent tarnish, our bookmarks undergo ultrasonic cleaning and electrolytic 24K gold, silver, or antique plating, followed by an automated electrostatic coat of optical-grade baked acrylic nano-lacquer (8-12 μm, 3H pencil hardness). In certified laboratory testing, this barrier withstands 48 hours of Neutral Salt Spray (ASTM B117) with zero discoloration.

What artwork files do you require, and how quickly can we review 2D/3D etching proofs?

A: We accept vector artwork in .AI, .EPS, .PDF, or high-resolution layered .PSD formats. If your team only has historic book illustrations, botanical sketches, or brand crests, our drafting engineers will generate a production-ready photochemical etching layout proof within 2 to 4 working hours at zero charge. Submit your artwork via our Direct Engineering RFQ Desk.

What are your minimum order quantities, prototype turnaround, and production schedules?

A: Pilot manufacturing runs start from 100 pieces per design, making it accessible for independent authors, boutique museums, and university alumni associations to produce bespoke collections. Production cost efficiencies scale significantly at 300, 500, and 1,000+ units. Phototooling and physical prototypes take 3 to 5 working days; full mass manufacturing takes 10 to 14 working days. Rush orders can be accommodated upon request.

Are these metal bookmarks certified safe for children’s literature and international retail?

A: Yes. Many countries regulate stationery under strict children’s product safety mandates. Gold Valley manufactures bookmarks using certified lead-free H65 brass tested to California Proposition 65 and USA CPSIA standards (total lead < 90 ppm, total cadmium < 100 ppm). Outer plating layers comply with EU REACH Annex XVII Entry 27 nickel release thresholds (< 0.2 μg/cm²/week to EN 1811:2023), ensuring safe, non-irritating contact for all readers.

Leave a Message

If you are interested in any product, please contact us. We will introduce our products to you in more detail