Filters are durable and highly stable over a wide temperature range.
They can be washed with almost any detergent or non-abrasive cleaner
and are far superior to plastic of gelatin filters.
densities range from 0.05 to 4.0 with any intermediate value.
Light transmission may be specified instead of density. These
filter coatings can be supplied on any glass substrate deposited
directly on optical elements when design does not allow sufficient
space for a separate filter element.