On Tue, 29 Jul 2008 09:10:38 +0100, Invisible wrote:

>>> If the grains in the film reacted to colour in some currently
>>> unreadable fashion and/or those alterations were transferred to the
>>> photo itself then you could, in theory, recover colour from a B&W
>>> photo or film by reading those imperfections.
>> 
>> That's kinda what I'm thinking.
> 
> ...so in other words, hypothetically the information might not be
> "gone". If that were indeed the case, it is at least plausible that
> somebody could possibly get it back, yes.

Oh, the information could well be gone, but it could be reconstructed 
from the available data.

Kinda like rebuilding a RAID-5 array using parity data.

Jim

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