[alt-photo] Re: "Expired" dichromate

[Tomas Sobota]

"Since, as I understand it, the more a chemical is diluted the less well it
keeps..."

By that you would say that Sodium chloride does not keep well in seawater ?

Tom Sobota

On Thu, Apr 29, 2010 at 8:48 PM, Judy Seigel <jseigel at panix.com> wrote:

>
> On Thu, 29 Apr 2010, Trevor Cunningham wrote:
>
>  I just got back from the chemical supplier and hey informed me that the
>> only ammonium dichromate they stock is a moistened product that has
>> expired...in 2005. I'm not sure what they mean by expired, and the supplier
>> want to know if I still want it. Any thoughts?
>>
>
> I've used ammonium dichromate mixed some 4 or 5 years earlier to working
> strength, then stored in a brown glass bottle, and found it performed as
> usual. Since, as I understand it, the more a chemical is diluted the less
> well it keeps, that suggests that the supplier's relatively concentrated
> stock would be fine. (Presumably, however, they'd let you get a relatively
> small amount, at a good price to try...)
>
> J.
>
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