Panel No. 24—Ochre. While the film seems intact, it has a very mottled appearance and examination shows eruptions of rust through the film, in several places.
Panel No. 27—Natural Barytes. Within a year the film became pin-holed, and corrosion was apparent. At the end of three years very little of the pigment was left upon the plate, having chalked and scaled off. Barytes has proved its usefulness as a constituent of a combination type of paint, but it should not be used alone.
Panel No. 28—Blanc Fixe. In the same condition as Panel No. 27, but slightly more chalking and disintegration was shown.
Panel Painted with Blanc Fixe. Right Side Stripped of Paint to Show Corrosion
Scaled Whiting Films
Chemically Active Pigments and Their Effect After Eighteen Months’ Wear