Prout's Brown Ink :
A medium brown non-waterproof drawing ink that dries to a satin finsih. C Roberson was commissioned to produce this ink by Samuel Prout (1783-1852) a draughtsman who painted the buildings of Western Europe in fine detail. It is a semi opaque lightfast ink consisting of Vandyke crystals, ammonium carbonate and water
Lightfast and non-waterproof.