The virus suspension containing 1% of any of the tested lignin additives had almost the same pH value of around 7.55. Therefore, it was difficult to state that the pH value of lignin additive played a key role in protecting the virus. The spectrophotometer, showed also that, all the lignin additives were similar in their high rate of UV-absorption (from 210-900 nm), especially in the most effective UV inactivation region (300-320 nm). Scaning Electronmicrograph (SEM) of polyhedra combined with the lignin additive indicated the possibility of physical protection of the polyhedra crystal by the tested additive. The latter appeared to surround the polyhedra with a continuous layer which was visible in the dark field of transmission electromicroscopic examination.