At J Tech Photonics, we often get questions about how different materials respond to laser engraving—especially colorful acrylics. So, we decided to put it to the test by engraving several shades of cast acrylic using our diode laser systems, and the results were enlightening!
The Experiment:
We tested a variety of acrylic colors using a J Tech blue diode laser and evaluated how well each color engraved. The image above shows our real results. Let’s break it down:
Top Performers – Excellent Contrast
These colors yielded crisp, high-contrast engravings:
- Black
- Brown
- Red
- Orange
- Yellow
These darker or warmer-toned acrylics absorb the blue laser light (455nm wavelength) more effectively, allowing the laser to vaporize the material and leave behind a visibly clear mark.
Mid-Range Performers – Usable, But Faint
These colors showed moderate results:
- Green
- White
They produced somewhat visible engravings, but not as sharp or dark. These colors reflect more of the blue laser energy, reducing effectiveness. You might still use them for subtle or backlit designs.
Least Effective – Low Contrast
- Blue
Blue acrylic was the least responsive in our test. Because it reflects or transmits much of the 455nm blue diode laser’s light, it barely marked the surface.
Why Color Matters
The key is absorption. Blue diode lasers (like those from J Tech) work best on materials that absorb blue light. That’s why black and warm colors like red or orange engrave well—they absorb the beam energy and convert it to heat, etching the surface. Conversely, blue surfaces reflect the beam and resist engraving.
Tips for Best Results
- Use cast acrylic – It engraves better than extruded types.
- Go slower for tough colors – Increasing dwell time can help faint colors show better.
- Consider contrast – If engraving text or logos, pick darker colors for legibility.
- Test settings – Every brand of acrylic is a little different.
Final Thoughts
Color choice is more than just aesthetics—it directly affects engraving performance. When planning your next acrylic project, reach for darker, more absorbent hues for the cleanest, sharpest results.