White phenomena on the surfaces of 24 unvarnished paintings by Willem Witsen (1860-1923) were examined. Five types could be distinguished using a stereo-microscope. Analyses showed that the spheres consisted of pure starch. while the other phenomena noted consisted of lead soaps and salts. https://www.chiggate.com/aptamil-allerpro-syneo-2-900g-online-now/