Glass prints

I don’t want to highjack peoples posts sharing with my questions. I have read about printing on glass and seen some use agar or gelatin. I know the difference between them thanks yo molecular gastronomy. But i have seen people say they apply agar/gelatin first and then cyanotype mix and others say they mix it all together. If i can get help with a recipe or get pointed in the right direction i will be very thankful.