Hi!
Ilford HP5 has enormous over-exposure capacity - two stops is
*nothing* (even for developing in perfectly fresh chemicals). I
routinely over-expose it by three to four stops, just because I want
shallow DOF in good light.
Expired chemicals are not likely to simply under-develop your film
evenly, but would rather cause all sorts of nasty uneven streaks, etc
(in my experience).
regards,
Dawid
On 02 Mar 2012, at 5:37 AM, Dan Mitchell wrote:
> I've been off-list for, ooh, four years or so; after two house moves,
> I finally got around to unpacking all my various darkroom stuff and
> testing it out again.
>
> It turns out, to my pleased surprise, to all work fairly well. The
> safelight bulb is dead, but a red LED rear bike light works as a
> replacement; the chemicals are all enormously past their expiry dates
> (and have been thoroughly frozen through a number of winters of garage
> storage), but still can make prints and develop film well enough for
> my
> admittedly fairly nonexacting standards.
>
>
> However, one question arose while testing this lot. I had a film
> loader full of a large amount of film, but I couldn't remember what
> sort
> of film it was. I filled a cartridge and shot it at ISO 100 as a
> reasonable starting point; developed it in elderly Rodinal for 6
> minutes
> at 1+25 (as if it were hp5+), and the resulting negatives appear to
> have
> come out okay.
>
> The weird thing is that now I've developed it, it turns out that the
> film _is_ HP5+ -- which is ISO 400. So I overexposed everything by two
> stops, but the negatives are not obviously overexposed at all.
>
> What are the chances that the excessive age of my chemicals (and
> film)
> have conspired to counteract the overexposure? I have a combination of
> exposure + development that seems to work, but I'm not sure why..
>
> thanks,
>
> -- dan
>
> --
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