Most carbon printers know (or at least should know) that dichromate-sensitized tissues are quite sensitive to relative humidity (or more properly, the moisture content of the tissues), which affects speed and contrast. This is one of the factors often cited against dichromate-sensitized tissues for color printing, the difficulty in controlling speed and contrast from tissue-to-tissue and print-to-print.

Are the UltraStable tissues as sensitive to differences in ambient humidity as dichromate-sensitized tissues?