Re: [APML] recommendations for development of tech pan

[Roland Roberts <roland@astrofoto.org>]

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>>>>> "Chuck" == Chuck Vaughn <aa6g@aa6g.org> writes:

    Chuck> Kirk,
    >> D19 is a powder and the entire packet has to mixed so its' useful
    >> shelf life is less.

    Chuck> This is not required. I weighed out enough D19 to make 16
    Chuck> oz batches for years and it worked fine. To increase the
    Chuck> lifetime of the powder I now divide the package up into 8
    Chuck> some sealable plastic bags and store them in the freezer. I
    Chuck> just used some that had been in the freezer for nearly 2
    Chuck> years. It had not oxidized.

I've also done this, but I stored some in plastic "ziplock"-style
sandwich bags (the thin-walled kind).  I don't recommend that as the
D19 powder turned brown over the course of about 9 months, stored at
room temperature.

Chuck, did you use heavier weight bags?  I'm wondering if it was the
bags or the temperature that killed mine.

roland
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		       PGP Key ID: 66 BC 3B CD
Roland B. Roberts, PhD                             RL Enterprises
roland@rlenter.com                            6818 Madeline Court
roland@astrofoto.org                           Brooklyn, NY 11220

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