Patent No. Europe 1,400,575
Akzo Nobel Decorative Coatings Ltd. has received a patent for a paint that changes color upon drying. The paint is useful for checking coverage of undercoat, contains secondary dye which is colored in liquid composition and different color, preferably colorless, in dry film. The composition may contain base, acid or buffer which interacts with the dye to give the first color. The dye may be indicator as specified. The paint composition may be waterborne