Response to Alternative to Xtol

This may sound petty, but: The slower the film speed the more effective are all methods to alter film speed -- chemical and physical. The opposite is true for high speed films. The effect can be seen in astro photography. The film speed of the extreme low speed emulsions is greatly affected by gas hypering. Several articles in the past have shown that these methods show by far not as great success on higher speed films, also due to the fact that some films already incoroporate preexposed silver halides.

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