Homebrew PCBs

It looks like a pigment is used to absorb the light where it then melts and
fuses to the material.  

 

http://www.engraversnetwork.com/products/thermarkcermark/how-it-works/

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Saturday, September 17, 2016 12:26 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Cermark Laser marking for PCB resist?

 

  

At 06:27 PM 17-09-16, you wrote:

  

Anyone tried this stuff? Spray it on, run a Laser over it, it turns black
and waterproof/permanent. A wet sponge wipes off the unLasered portion.

https://www.cermarksales.com/ 

I don't know what the lowest power Laser is that can be practically used
with this. Their website is a bit light on details.

I found a distributor with a lot more information. It only mentions CO2 and
Fiber Lasers.

http://www.engraversnetwork.com/products/thermarkcermark/laser-settings-char
t/ 

I have no idea if one of those blue and green 5,500mW solid state Lasers on
eBay, Amazon, and Bangood would work, for instance added on to an existing
3D printer or CNC engraver/carver. CO2 lasers are far IR at around 10,000nm.


Are those solutions color sensitive or only thermal sensitive?
Why not 1W laser with reduced speed 10 times (from the recommended 15cm/sec)
for the LMM14 spray?
Cristian