guess after more than 30 try. I came with a great result again I finally engrave on a clear glass with my 15 w. ortur laser master.
- used acrylic black paint it print It fail short
- I used acrylic red paint fail extremely short
- I used brown acrylic paint it print it the result came out great.
in all of them I use the same speed 508/85 with 4 pass
see attached result with a white background and without white background.
I believe the only way to get a good result with laser on clear glass is to use brown acrylic paint