1) Blots 2) Errors 3) Flaws 4) Warts 
there are often imperfections in the structure of the leaf. They are small holes, areas where the leaf may have been beaten too thin or the leaf became damaged in handling. When gilding on glass the light passing through the imperfections of the leaf on the glass accentuating the imperfections of the leaf. Slight imperfections, meaning small pin ho...