Removing Foxing

There has been no definite cure for for neutralising the mildew spore, Zhaensdorf himself developed a formula for the removal of foxing in the 19th Century, two of the ingredients were hydrochloric acid and calcium chloride which is no wonder that the fibres of the paper break down after a while and the paper starts to disintergrate and the ink or what ever medium can be rubbed off!