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The alcohol should be sprayed on first (diluted w/water) - let it sit for a few minutes. Then into the CaOH bath...
Not much luck with the latest wash. Just a bit more dirt came out.
I figure I want to keep the poster intact thanks professor.
My calcium hydrochlorite arrived today. So I spot bleached the poster. Pretty pleased with the outcome and learnt a few things on the way. Probably used to much in the blue area up top left. The poor poster ahs been washed a few times now. A few more tears and tiny holes but I'm extremely happy nonetheless.
First old photo
I dry it right where it is. On carpet tiles that are very flat. Turn on my ceiling fan to low. That way there is air virtually around the whole poster and it dries very evenly.
basic article on paper and deacidification. related mostly to book paper, but basics still apply.
Had to do some extra spot bleaching to get the two heavy stains above and below "Robot"
@Sven Dried it on my carpet tiles with the ceiling fan on low.
Thanks fellas.@Sven Dried it on my carpet tiles with the ceiling fan on low.