Intensifying screens & pre-flashing

[David D Morgan]

Paul Digard wrote:
> There's also preflashing of the film to consider; increases the
> sensitivity a bit more, and gives a more linear response with faint
> bands.  Also to do with the grain structure of the film needing more
> than one hit to go black when developed I think.  The Amersham book
> also talks about sensitizing the film by baking it in an N2/H2 mix,
> but I've never tried that, or seen it used.
> 

What are the conditions for pre-flashing film ?

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