calcium silicate were found to belong to the latter category apparently mg 2 and or silicate species released by these products into the staining process are accountable for the noticeable adverse interference with the tannin stain inhibitive activity of znncn the active component of the composite pigments furthermore no significant synergy was observable in relation to pigment composites according to the present invention containing tio 2 rutile precipitated baso 4 mica silica kaolin clay hydrated aluminum silicate nepheline syenite anhydrous sodium potassium aluminum silicate or zn 3 po 4 2 2h 2 o srhpo 4 h 2 o mghpo 4 h 2 o ca 3 po 4 2 as well as precipitated caco 3 srco 3 nevertheless composites comprising the above enlisted support constituents are generally characterized by excellent pigmentary properties comparable to znncn in respect to tannin stain inhibition several products of various chemical composition and appropriate physical properties solubility color were identified according to the present invention to function as synergistic substrate constituent of znncn based composite pigments in intricate physical association with znncn or basic zinc cyanamide such products form solid composite systems characterized by excellent overall pigmentary properties which typically display fungus growth control activity and synergism in respect to tannin stain inhibition it was learned pursuant to the present invention that few selected carbonates characterized by appropriate color and solubility and more specifically basic zinc carbonate basic zirconyl carbonate and ce 3 or la 3 carbonate display synergy in the above specified sense it will be observed that carbonates typically are non.