David Nunes Carvalho

The Hebrew word for ink is deyo, so called from its blackness.

The British government advertises for tenders each year, the requirements for black writing ink in 1889 reads: "To be made of Best Galls, Sulphate of Iron, and Gum. The Sulphate of Iron not to exceed in quantity one-third of the weight of the Galls used, and the specific gravity of the matured Ink not to exceed 1045 degrees (distilled water being 1000 degrees)." That of Black Copying Ink "To be made of the above materials, but of a strength one fourth greater than the Writing Ink, and with the addition of Sugar or Glycerine. The specific gravity of the matured Ink not. to exceed 1085 degrees." And that of Blue-Black Writing Ink "To be made of finest Galls, Sulphate of Iron, Gum, Indigo, and Sulphuric Acid. The specific gravity of the Ink when matured not to exceed 1035 degrees.

Red ink made of vermilion (a composition of mercury, sulphur and potash) and cinnabar (native mercuric sulphide) were employed in the writing of the titles as was blue ink made of indigo, cobalt or oxide of copper. Tyrian purple was used for coloring the parchment or vellum.