[alt-photo] Re: Another tricolor...

[Katharine Thayer]

Bruce McEvoy's  analysis:

http://handprint.com/HP/WCL/pigmt6.html#toxicity




On Jun 9, 2010, at 5:05 PM, Paul Viapiano wrote:

> It goes to a municipal toxic disposal facility.
>
> This is my personal solution in stewardship of my community and its  
> environment.
>
> Mike Ware explained to me about the breakdown of carcinogenic  
> chromium in dichromates to a less harmful chromium (III) state  
> after mixing with a reducing agent, and in that alkaline state  
> precipitating to a pretty inert hydroxide. He also mentioned that  
> he wouldn't opine on disposal or its ethics, if I recall.
>
> Mike reads the list and I hope he'll correct me if I have it wrong.  
> He is an awesome member of this community and I still feel bad  
> about my remark from several months ago in which a secondhand  
> hearsaid comment triggered a reaction from me not seen since I  
> moved out of the old neighborhood ;-)
>
> Paul
>
>
>
> ----- Original Message ----- From: "Doug Taylor"  
> <dougtaylor13 at mac.com>
> To: "The alternative photographic processes mailing list" <alt- 
> photo-process-list at lists.altphotolist.org>
> Sent: Wednesday, June 09, 2010 4:44 PM
> Subject: [alt-photo] Re: Another tricolor...
>
>
>
>> Paul,
>>
>> What do you do with the first wash water that gets bottled?
>>
>> Thanks, Doug
>>
>>
>> On Jun 9, 2010, at 7:23 PM, Paul Viapiano wrote:
>>
>>
>>> I'm not a pigment addict and couldn't tell you a real cad from a   
>>> fake one, and all those PY PR PB numbers or whatever? Well, who   
>>> knows about all that, I certainly don't.
>>>
>>> And, yes, cadmium is not a good thing for the environment.  
>>> That's  why it was removed from gelatin silver paper and so many  
>>> other  things years ago.
>>>
>>> But, like cadmium, potassium and ammonium dichromates are also  
>>> devastating to the environment regardless of who tells you that  
>>> they  are OK or benign. So that is why none of it, cadmium or  
>>> dichromate,  goes down my drain. All first wash water gets  
>>> bottled and all brush  cleaning water along with it. None of this  
>>> stuff belongs in a public  drain, regardless of who tells you  
>>> otherwise.
>>>
>>> Don't rely on experts. Experts said offshore underwater drilling  
>>> was safe, too.
>>>
>>> Thanks, Judy, for this opportunity to get on my semi-annual soapbox.
>>>
>>> Paul
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Judy Seigel" <jseigel at panix.com>
>>> To: "The alternative photographic processes mailing list" <alt- 
>>> photo-process-list at lists.altphotolist.org
>>> >
>>> Sent: Wednesday, June 09, 2010 3:54 PM
>>> Subject: [alt-photo] Re: Another tricolor...
>>>
>>>
>>>
>>>>
>>>> On Wed, 9 Jun 2010, Marek Matusz wrote:
>>>>
>>>>
>>>>>
>>>>> Paul
>>>>>
>>>>> Cadmium is a very intense and opaque yellow. Did you use it as  
>>>>> a  first layer? What was your registration method.
>>>>>
>>>>> For oil painting you can not substitute it with anything else.  
>>>>> I wonder if I am missing something by not using it.
>>>>>
>>>>> Marek
>>>>>
>>>>
>>>> I speak here beyond my area of expertise, but re something I've   
>>>> heard so ioften and on such authority, I feel compelled to  
>>>> mention  it...
>>>>
>>>> If that IS real *cadmium,* it's pernicious & evil  
>>>> environmentally,  so (presumably) even in small quantities  
>>>> shouldn't be added to ....  free flowing water.
>>>>
>>>> (This has in the past been replied to as OK, benign, etc. on  
>>>> the  list, but I've continued to hear/read about the horror of  
>>>> cadmium,  so mention it again...)
>>>>
>>>> J.
>>>>
>>>>
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