The transparent triacetylcellulose membranes were produced
from waste photographic film tapes that were previously
treated with commercial sodium hypochlorite for
several seconds in order to remove colored gelatinous layers.
The films were treated with a clear solution of a mixture of
VB and DPA in ethylene diamine for 4 min at ambient
temperature. Then they were washed with water for removing
ethylene diamine and loosely trapped dyes. The membranes
were finally washed with detergent solution and water. Prepared
membranes were kept under water when not in use