Tannin stain removal from Sawn Sandstone.
Tannin is a substance found in many different plants. Tannins is notably found naturally occurring in grapes, tea leaves, oak and eucalyptus leaves. Tannin stain on Sandstone paving: Tannins produce the brown leafy hues inside the foliage of some trees and various other trees. The golden yellow within a number of leaves, one example, is…