Question

What is collodion?NCERT Class XIIChemistry - Exemplar ProblemsChapter 5. Surface Chemistry

Answer 1

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Collodion is a flammable, syrupy solution of pyroxylin  in ether and alcohol. There are two basic types: flexible , non-flexible.
The flexible type is often used as a surgical dressing or to hold dressings in place. When painted on the skin, collodion dries to form a flexible nitrocellulose film.
non-flexible collodion mostly used for theatrical make up . 
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Answer 2

Answer:

it is a 4% solution of a nitrocellulose in a mixture of alcohol and ether