Sanguine Paint, I1

Process & Production

This recipe consisted of a mixture of three materials, iron(II) sulphate heptahydrate (FeSO4·7H2O), lead-silica glass (PbO·SiO2), and red earth (Crayon Rouge) (Al2O3-SiO2-Fe2O3) in the proportion of 4:4:1 by wt. The lead-silica glass had been previously prepared according to Félibien (1676) and Blancourt (1697) (PbO: SiO2, 3:1 by wt). This mixture was then ground in water and painted on a glass with gum Arabic dissolved in distilled water. Finally the paint was fired at 620ºC for 30 minutes (ramp 3ºC/minute).

Find more at:
Â. Santos, M. Vilarigues (2019). Sanguine Paint: Production, Characterization, and Adhesion to the Glass Substrate. Studies in Conservation 64, 4, 221-239.

Recipe Details

Ingredients:
iron(II) sulphate heptahydrate (FeSO4·7H2O), lead-silica glass (PbO: SiO2, 3:1 by wt), red earth (Crayon Rouge) (Al2O3-SiO2-Fe2O3), gum Arabic, distilled water.
Recipe Source: Sanguine reconstruction of recipe number 43 by Johann Kunckel (“Ars Vitraria experimentalis”, 1679, pp 353).