Yikes! Melted glass. That might count it out as an etch resist, simply because I have no idea how you'd remove it without mechanically scraping it off.
Steve Greenfield AE7HD
---In Homebrew_PCBs@yahoogroups.com, <jeff.heiss@...> wrote :
---In Homebrew_PCBs@yahoogroups.com, <jeff.heiss@...> wrote :
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/