We were painting a lantern, when someone spilled dark paint over a yellow part.
The process for creating is the following:
You stretch the cloth over a wooden frame. (ca 2.5m x 2.5m/ 8foot by 8 foot) The cloth is then coated in multiple layers of gelatin. The gelatin tightens the cloth, and hardens it a bit, so you can paint on it.
The problem is, that it is lit from the back, so you can't overpaint it.
We were drawing with watercolor.
We can put a bit of water on it, however, too much will remove the gelatin, which makes us unable to paint there. Rubbing too much will remove the gelatin as well.
This photo is from the inside of the lantern. Click image to enlarge
Is there a way to remove some color, by not destroying the rest?
How would the restoration process look like, when the painting was old? Maybe I could adapt this?