1853 R. Hunt ManPhotogr. 264After coating the plate with collodio-iodide. 
c1865 J. Wylde in Circ. Sc. I. 159/2The collodio albumen process. 
1865 Reader No. 151. 578/3The collodio-chloride process of Mr. Simpson. 
collodio-
combining form 
Etymology: collodion 
 : collodion 
< collodiotype >
< collodiotype >