Microscopic needle-shaped crystals of herapathite are embedded in a plastic base. 将碘硫酸奎宁的微观针状晶体嵌于塑料片基之中。
Thinner sheets of tough and can be used as colloidal silver compounds based on-chip, so that it became the first practical photographic film. 更薄和更韧的薄片可以用作胶状银化合物的片基,这样它就成了第一种实用的照相底片。