We add the silver into our products in a very fine-dispersed form: in colloidal form or in nano-form. Such dispersion is made of tiny hundredth-fractions-of-micron particles of the pure silver uniformly distributed in a product gratifying to an emulsifier. In a case of treatment of wooden surface, the silver particles sediment in wood cells as in a sponge; and, when needed, they release silver ions slowly and protect the surface from biological factors. Silver is insoluble in water; that is why silver particles sedimented in the wood structure, are not washed away with water, due to which absolutely safe and long wood protection is ensured, including that under water action. In the concentrations used by us, the silver does not change a wood color.