Iron Gall Ink
The earliest documents written in iron gall ink on papyrus date back into the first centuries after Christ. Because of it's indelibility, it was the ink of choice for documentation from the Middle Ages to the twentieth century.k here to edit text. Iron gall ink is primarily made from tannin (most often extracted from galls), vitriol (iron sulfate), gum, and water.
It was very popular with artists as a drawing ink, used with quill, reed pen or brush. The coloring strength of iron gall ink was high and it had, depending on its manufacture, a deep blue-black, velvety tone. The range of objects that contain iron gall ink is enormous. Iron gall ink is found on manuscripts, music scores, drawings, letters, maps, and official documents such as wills, bookkeeping records, logs, real estate transactions, etc. (EE 1998)
Sources: https://www.bing.com/images/search?view
https://irongallink.org/igi_indexc752.html
Preservation Solutions’ Klucel G is a powder in the raw form. When mixed with denatured or isopropyl alcohol it forms a gel. This gel is also referred to as Cellugel.
Japanese Tissue
Japanese tissue is a thin, strong paper made from vegetable fibers.
Japanese tissue may be made from one of three plants, the kōzo plant,
the mitsumata shrub and the gampi tree. The long, strong fibers of the
kōzo plant produce very strong, dimensionally stable papers, and are the
most commonly used fibers in the making of Japanese paper.
Tissue made from kōzo, or kōzogami, comes in varying thicknesses and colors, and is an ideal paper to use in the mending of books. The majority of mending tissues are made from kōzo fibers, though mitsumata and gampi papers also are used.
Source: en.wikipedia.org/wiki/Japanese_tissue