When consolidating powdery, cracking, or flaking paint, care must be taken to avoid any changes in the appearance of the media. These include discoloration and formation of a white haze or tidelines. The chemical and physical tolerance between the consolidant, support, and media must also be considered. The consolidant, JunFunori®, an adhesive produced by the chemical refinement of natural red algae (Gloiopeltis furcata) used in Japan to make Funori, has shown good results. It is especially successful when used in conjunction with sturgeon glue.
http://cool.conservation-us.org/iada/ta05a_eng.pdf

Tideline: The dark line created by drying liquid, at the farthest point of liquid migration in the paper or board. The line itself is dirt transported by the liquid; the dirt embeds itself deeply into the paper fibres becoming tenacious and difficult to remove.

http://www.art-conservation.org/Glos_pap/Tideline/gloss_det_...