Moulded nitrate of silver, commonly known as collodion, is a substance widely used in photography. This material has several synonymous terms that refer to its nature and purpose in the field of photography. One equivalent term is "guncotton", which highlights its explosive potential when in a more unstable form. Another synonym used is "nitrocellulose", which emphasizes its composition of cellulose that has undergone nitration. Furthermore, "wetplate" is a popular term for moulded nitrate of silver in reference to the wet collodion process photographers use to create images on glass or metal plates. Whichever term is used, the significance of moulded nitrate of silver remains as a fundamental element in historical photographic techniques.