rubrication

A making red; specifically, the act of illuminating with red or colored letters, words, etc., as old manuscripts and books.

That which is rubricated, or done in red; a letter, word, or other part of a text separately executed in red, or, in general, in color.

The act of formulating, as a rubric; arranging as or with rubrics.

A form of calligraphy, in medieval manuscripts, in which added text was coloured in red