A Practical Manual of the Collodion Process, Giving in Detail a Method For Producing Positive and Negative Pictures on Glass and Paper.

CHAPTER VII.

Chapter 729 wordsPublic domain

Helio Process.--An Entire Process for Producing Collodion Positives and Negatives with one Bath, and in much less time than by any other known Process: by Helio--Photographic Patents 164