[alt-photo] Re: "Moistened" AD (4th and final attempt)

[Tomas Sobota]

Trevor, if you need a small quantity of some product that you can't get
there just let me know, perhaps I can buy it here and send it by mail to
you.
Tom Sobota
Madrid, Spain

On Thu, Jan 7, 2010 at 8:38 PM, Trevor Cunningham
<trevor at chalkjockeys.com>wrote:

> I think I'm going to have to take what I can get here. The company is the
> distributor to the distributors...bit of a monopoly. And the Saudis are a
> touch particular about chemicals crossing their border. Lots of smiles and
> thank yous when one can get what they need.
>
> Tomas Sobota wrote:
>
>> Well, it could be that removing the last 0.5% - 3% of water is difficult
>> or
>> expensive, or that the anhydrous product is difficult to keep, but I don't
>> really know. I think that the crystallised form also has a certain amount
>> of
>> structural water.
>> For alt photo purposes there would be no difference since you will be
>> mixing
>> it with water anyway.
>> A couple of years ago I paid some 20 euros for a kg of the product
>> (technical grade) here in Madrid, so you see that there is a difference
>> between technical and reagent grade.
>> Tom Sobota
>> Madrid, Spain
>>
>> On Thu, Jan 7, 2010 at 7:46 PM, Trevor Cunningham
>> <trevor at chalkjockeys.com>wrote:
>>
>>
>>
>>> 1kg of the powder is a little over $100. But the moistened is actually a
>>> little cheaper. As long as it does the same thing, I'm a happy camper. I
>>> get
>>> the impression from them that they might need to back order the crystal
>>> form. Would storage become an issue with keeping it "moist"? Or could I
>>> turn
>>> it all into solution and leave it on the shelf?
>>>
>>> What does .5% - 3 water mean? The sheet you linked is exactly the same
>>> product, # and all.
>>>
>>>
>>>
>>> Tomas Sobota wrote:
>>>
>>>
>>>
>>>> Not sure why they moist the Am. dichromate (0.5% - 3 water) but this is
>>>> a
>>>> pure reagent for analysis and it will probably be expensive.
>>>>
>>>>
>>>>
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