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Yes—a thin coating of white PVA glue, water, and titanium dioxide can help a CO₂ laser leave a dark, visible mark on glass. The reported recipe is 2 parts PVA glue, 1 part water, and 2 parts powdered titanium dioxide. It is a promising maker experiment, not a universal glass-engraving formula: the featured test used a 40-watt CO₂ laser, and the source gives no verified power or speed settings.
What the pigment changes
Clear glass can be difficult to mark visibly with a hobby laser. In this method, titanium dioxide supplies a pigment layer that the laser can act on; the PVA holds the powder in place, while water makes the mixture easier to spread. The Hackaday report attributes the resulting dark line to titanium dioxide changing under laser heat and remaining on the glass. That explanation is the report’s account, not a mechanism independently established here.
Call the result coated glass marking or surface engraving rather than assuming it is deep engraving. The visible contrast comes from the treated coating, and the laser may also leave a shallow fractured or chipped track in the glass. The available report does not establish the mark’s depth, how much material is removed, whether pigment is permanently fused into the glass, or how well the result resists washing and abrasion.
Hackaday’s January 28, 2025 report describes a 40-watt CO₂ laser, plain float glass, and ceramic tile. It does not show that the recipe works on every glass type or laser.
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Recipe and application
Measure the ingredients in the same units—spoons, cups, or another convenient volume—and keep the ratio:
- 2 parts white PVA glue
- 1 part water
- 2 parts powdered titanium dioxide
Stir until the pigment is evenly dispersed, then brush on one thin coat. The report recommends one or two coats; use a second only if the first looks translucent or patchy. Let the coating dry fully before lasering. No brand, pigment grade, particle size, exact coating thickness, or drying time is specified, so treat these as starting conditions rather than a production specification.
- Start with a small piece of inexpensive, uncoated float glass. Clean it to remove dust and oily residue, and handle its edges carefully.
- Mix the slurry in a way that minimizes dust. Stir again if the pigment settles.
- Brush on a thin, even layer. Avoid ridges and puddles, which can make results inconsistent.
- Let the layer dry completely. If it has visible cracks or bare patches, adjust application before changing laser settings.
- Secure and focus the test piece according to the machine maker’s instructions, then run a small test design.
- After the piece has cooled, inspect the line and try mild soap and water with a nonabrasive cloth on a test piece before cleaning a valued object. The cited report does not document a tested cleanup method.
On white ceramic tile, the coating can be hard to see as you brush it on. The report says one or two drops of food coloring were added for visibility. This is an application aid, not an established part of the marking reaction.
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The underlying Instructables project is the original how-to reference for the experiment and provides additional process context.
Use a CO₂ laser, and establish settings with tests
The featured result was made with a 40-watt CO₂ laser. That supports trying the method on a comparable CO₂ machine; it does not establish compatibility with every CO₂ machine, lens, power level, or material. The report provides no reproducible power, speed, focus, resolution, air-assist, or pass settings, so there is no evidence-backed universal settings table.
Do not assume the result transfers to a diode laser. Hackaday commenters describe separate acrylic-paint experiments on glass using diode lasers, including 5-watt and 20-watt machines. Those are anecdotes about different coatings and setups, not evidence that this TiO₂ recipe works on diode lasers. A fiber laser is likewise not established as suitable for ordinary glass by this report.
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Build a small test grid on matching scrap instead of guessing at a “best” setting:
- Keep glass, coating, focus, and artwork constant while changing one laser variable at a time.
- Begin with low energy and increase it gradually. Record power, speed, passes, air assist, lens, focus height, and how many coats you applied.
- Use a simple vector line, square, and short text sample. Check for an even dark mark, missing sections, soot, cracking, and edge chips.
- Stop increasing energy when the glass cracks, chips excessively, or the result worsens. A successful setting on one piece of glass is not a guarantee for another.
As practical troubleshooting guidance—not settings measured in the cited experiment—too little energy may give a faint or incomplete mark; too much, a slow pass, or repeated passes may increase heat damage and chipping. Poor focus can make lines broad, inconsistent, or weak. Change one variable at a time so the test tells you something.
Vector or raster?
The experimenter reported better results with vector files than raster files, but supplied no controlled comparison or settings. Clean vector paths are a reasonable first test for lines, outlines, and text. Raster can still be useful for filled graphics or shading experiments; larger filled areas may expose uneven coating or build up more heat. Neither format is guaranteed to work better in every machine and design.
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Choose test material carefully
- Plain float glass: The featured experiment reports good results. It is the most sensible first test, using a small piece you can afford to discard.
- Ceramic tile: The report says tile also worked. Use a small test tile, and consider a little food coloring in the coating if it is hard to see against white.
- Tempered glass: Do not treat it as a beginner substrate. A commenter reports that some tempered glass does not engrave neatly, and the report supplies no tested procedure or safety protocol for it.
- Drinkware, curved or thin glass, laminated glass, mirrors, tinted or coated glass: These are not validated by the featured test. Curvature, treatments, backing, and composition can change the result or introduce additional hazards. Do not laser unknown coatings, mirror backing, or plastic interlayers.
- Acrylic: Acrylic did not work in the featured experiment. Commenters’ reports of acrylic paint producing marks in other setups are different experiments, not a contradiction that proves this mixture works on acrylic.
“Glass” is not a single predictable material. Test the exact stock, coating, and machine combination before committing an object.
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Troubleshooting the first test
- The line is faint, gray, or broken.
- Check for uneven or too-thin coating and confirm focus. Then make a small test grid, increasing energy gradually rather than changing several settings together. The source does not identify a guaranteed cause or prescribe a universal setting.
- The coating moves or blows away.
- PVA’s reported role is to bind the pigment, including against air assist. Check that the layer is even and fully dry; if the machine permits, test a lower air-assist setting while following its operating guidance.
- The glass cracks or chips.
- Stop and discard damaged pieces safely. On scrap, reduce heat input—for example, test lower power, faster motion, or fewer passes one change at a time. These are practical directions, not validated settings. The comment discussion also warns that heat can crack glass.
- The line is uneven.
- Look for brush ridges, bare spots, or a coating that dried inconsistently. Standardize the application before adjusting the laser.
- Residue will not come off readily.
- Test mild soap and water first with a nonabrasive cloth. The cited experiment does not establish cleanup performance; do not assume solvents or abrasive tools are safe for every glass surface or coating.
One commenter mentions wet newsprint as a separate approach intended to reduce chipping in ordinary CO₂ glass engraving. Treat this as anecdotal, not a guaranteed fix or part of the TiO₂ recipe.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Safety matters as much as contrast
- Use an enclosed laser with functioning interlocks and appropriate exhaust ventilation. Follow the machine manufacturer’s material restrictions and operating instructions.
- Never look at the beam or reflections. Use eye protection appropriate to the laser system when the manufacturer requires it. Do not leave the machine unattended, and keep combustible materials clear.
- Titanium dioxide is a powder: avoid creating airborne dust during measuring, mixing, application, and cleanup. Consult the pigment’s current safety data sheet and use suitable respiratory protection where required. Do not dry-sweep or otherwise disperse contaminated powder.
- Do not assume the PVA-based coating is harmless when heated. The cited report provides no emissions testing or exposure assessment; ventilate appropriately and follow the laser maker’s guidance.
- Wear suitable protection when handling glass and dispose of cracked pieces carefully. Do not use treated or marked items for food contact; food safety has not been established.
When another method makes more sense
This slurry is worth trying if you already have a CO₂ laser, want a dark decorative mark, and can afford to experiment on scrap. Its ingredients are straightforward, and the report describes results on float glass and ceramic tile. The trade-off is uncertainty: settings, cleanup, durability, and repeatability are not documented.
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For production work, valuable or heat-treated glass, a deep engraving, or a repeatable finish, use a method and equipment documented for the exact substrate—or outsource the job. Other approaches mentioned in the discussion include uncoated CO₂ marking, wet newsprint, acrylic-paint coatings, and commercial films or marking products. They involve different machines and processes; commenter reports are not controlled comparisons, and a product sold for marking metal is not automatically compatible with glass. Glass-etching paste is a separate chemical process, not a cleanup step or substitute ingredient for this laser coating.
For more background, see the original Hackaday report and discussion. Its comments are useful as anecdotal leads, not as a compatibility chart.
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