In recent years a company has developed a method of removing foxing using a laser method, I'm not sure how the paper fibres would stand up to this treatment, but it isn't on the markert as yet.
To use my method firstly you need to understand the structure of the manufacture of the many different types of paper, short fibres, long fibres, paper size etc, because what you take out you must definitley replace with the correct ingredients.
Secondly before neutralizing the spore, a mordant must be created to "fix" the medium to the paper albeit ink pigments, water colour pigments, et al.
I recently had an enquiry from a head conservator at a large institution stating:
"I am very impressed with your information on foxing.
I was hoping to find out how you have been successful in removing foxing (and keeping it gone) from prints that are frames without a tissue.
I have just retreated a very rare print which was treated 10 years ago for foxing. I retreated it successfully by spot bleaching half a year ago and now it has reoccurred".
Don't these people know they are only "curators" of national treasures?? This "conservator" has used "acid" to remove foxing.This will break down the cellulose and the size in the paper and cellular degredation will occur resulting in ultimate disintegration. I guess she will realize when the print is returned with holes where it has been "treated".
My formulae has proven the neutralised spore will never come back because the formulae also neutralises and removes the ferrous oxide (the food source) in the paper whereas all bleaching methods do not. Therefore paper I have treated that is stored in the correct conditions that cause foxing will never become affected again as the iron that the spore is attracted to is also removed from the paper....... Bleach treated or chemical treated papers on the other hand will always be subject to the foxing returning and eventual disintegration.