Marking chalk blue yellow 120 g. Plus point: perfectly clean line as a result of the high density and low volatility powder. Optimal adhesion of powder to the line. For interior use on plasterboard prior to painting. · · · Cleans off with soapy water on non-porous surfaces · · High density, non-volatile powder for a perfectly clear line. · · Finely-balanced sodium carbonate, sulphur and silica refills for maximum adhesion of the powder to the line. · · Powder Composition Yellow Iron Oxide · · Easy to apply · · Net weight: 120 g.