Excerpt from Studio Light, 1917, Vol. 8
On the introduction of the wet plate, a more aggravated form of halation was encountered, due to the reflection of light from the back Of the glass support to the under side of the emulsion. This, however, was not as great as the halation of the dry plate, for the color of the iodized collodion emulsion of the wet plate acted as a filter and cut out much of the light which would otherwise have been reflected.
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