skinem wrote:eberntson wrote:What color where the ink back in Catholic school? Black & blue were popular this century, but in the 1800’s there seems to have been a lot of umber colored ink. Leonardo Da Vinci notes are all brown ink.
I thought the inks were all blue or black and that the umber color was due to the breaking down of pigments and acids in the paper over time. What materials produced the umber color come from?
Here's a site on iron gall inks, which explains some color changes in old documents.