[alt-photo] Keeping dichromate in plastic botle

[Katharine Thayer]

Welcome, Walter.  I have always kept my dichromate solution in a  
plastic bottle, with no discernible harm.  I've used the brown  
plastic bottles I bought at a photo supply store a long time ago.   I  
don't know if it's necessary to protect the dichromate from light;  
dichromate by itself without something to react with shouldn't be  
activated by light, but I've just always used those bottles. .  Glass  
isn't necessary, for sure.
Katharine

On Mar 3, 2010, at 9:48 AM, walter wrote:

> Hi, I'm new to the list.  I actually came here looking for a solution
> to the same problem, and I think I also used a bit too much gum (more
> inadvertently though; my dichromate working methods have been a bit
> inconsistent since I mix up small batches for single printing
> sessions).  Because of the time involved I haven't tried to print
> again since then (last week) but I'm glad to see you've found that to
> be a culprit.  It sounds like exactly the same scenario I was facing.
>
> Now, I'm going to mix up a bottle of saturated K-dichromate to keep
> that variable constant.  Have any of you used plastic bottles?  I'm
> having trouble finding brown glass bottles but the drug store gave me
> a couple of plastic ones used for dispensing cough syrup / liquid
> medication.  Would any of you seasoned gum printers recommend skipping
> that and ordering some glass ones?  I know where to get them but I'm
> sort of intensely trying to work out the printing methods right now
> and I don't want to wait the week or two for a delivery.
>
> -Walter
>
>
> On Wed, Mar 3, 2010 at 4:00 AM,
> <alt-photo-process-list-request at lists.altphotolist.org> wrote:
>
>
>>
>>
>>> I was attempting to produce very saturated layers and in that  
>>> attempt, I
>>>
>> increased the gum concentration in order to accommodate (without  
>> staining),
>> the amount of pigment that was required. Once I reduced the gum  
>> and pigment
>> concentration, the adhesion was improved and the top layer behaved. <
>>
>> Happy for you!
>>
>>
>>> I still have no understanding as to why there were no problems  
>>> with these
>>>
>> thick layers when laying down the cyan layer first. <
>>
>> Could be something about the structural/physical properties of the  
>> specific
>> pigments that you were using or something else, who knows? Don't  
>> dig too
>> much, go for the image! ;)
>>
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