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

[Trevor Cunningham]

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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