Chalk paint/milk paint issue
I am new here. I am restoring a poster from 1912. Its on a very thick cardstock. It is very old and fragile. It has a white paint that is chalky in texture that the background was painted with and then the text in black. When ever you touch the background this white paint rubs off. How can I stop this? Is there something I can spray on the poster to stop the original paints from degrading? Thanks!
This Vintage Movie Poster Forum is powered by some old cinema posters, the flame retardant properties of a Top Gun Daybill, and a
British Quad which has been folded just the right amount of times and shoved under one of the corners to stop the place from wobbling.