
Danny Baronian sent these two images. The glass piece was a panel Rick Glawson did a long time ago. I believe he brought it to a couple of Letterhead meetings and a few people surely got to see it in person.
Others might have the more detailed steps, but I am pretty sure it went like this:
- 1: Make a screen which exposes protects the black lines.
2: Screen an acid resist on the glass which exposes clear glass.
3: Apply the acid, which eats into the exposed glass.
4: Clean off acid and the resist.
5: Paint the glass with black paint.
6: Carefully, using a razor blade, scrape off all the black, leaving black in the etched depressions.
7: Using a water gild, apply gold over most of the factory or designs.
8: Using a q-tip, carefully remove areas of the water gilded gold, such as in the windows.
9. Water gild over the windows with white gold or paladium.
10: Back up the necessary gilded/silver areas.

Rick used this original piece to create the original line art.
Remember: Acid Etching can be dangerous! Wear protection and read all necessary safety documents.