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Bruce Appel

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I am curious to try Pat Gainers vitamin c developers, and have read all the stuff on Unblinking Eye. Where can I get a reprint of his article “The Role of Antifreeze in Photographic Science” in Photo Techniques Magazine of March/April 2004.?
My mext question is about propylene glycol. I realize it is less toxic than ethylene glycol, but at the amounts used I can't imagine that ethylene glycol could be all that bad, as long as you don't drink it.If I read Unblinking Eye correctly, the stock soution is diluted 1:50 prior to use, so by my math, with my tanks, that means 10cc of ethylene glycol for each tank. It certainly sounds pretty insignificant to me, or am I missing something?
 

Flotsam

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"Gadget" Gainer has been very generous in responding to posts in this forum. Perhaps you will get a truly authoritative answer to your questions.
 

Maine-iac

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I wrote Pat once and told him that the 1:50 dilution gave me developing times that were longer than I preferred (10-12 minutes). He wrote back and suggested trying 1:25 or 1:30 at the times I wanted (6-7 minutes). This worked very well.

Larry
 

gainer

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As suggested, you can get most back issues of Photo Techniques. As to the type of glycol, the real danger is to those who do not know that something sweet is not always something good to drink. As long as no children of pets can get hold of it, ethylene is good. HC110 uses diethylene glycol and a bunch of other organic compounds. The label says if you spill it on your shoes, destroy the shoes or wash them well.
 

Aggie

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gainer said:
As suggested, you can get most back issues of Photo Techniques. As to the type of glycol, the real danger is to those who do not know that something sweet is not always something good to drink. As long as no children of pets can get hold of it, ethylene is good. HC110 uses diethylene glycol and a bunch of other organic compounds. The label says if you spill it on your shoes, destroy the shoes or wash them well.
Isn't the preservative in Dr. Pepper (the soda pop) ethylene glycol? I know in my colege chem classes, we all stopped drinking it after the professor showed us on the label that it contained antifreeze.
 

garryl

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Aggie said:
Isn't the preservative in Dr. Pepper (the soda pop) ethylene glycol? I know in my colege chem classes, we all stopped drinking it after the professor showed us on the label that it contained antifreeze.

an then they all started drinking Coke- which disolve their teeth. Then
the nails through out the the chem lab. But they now have the cleanest batteries and car bumpers in the neighborhood. :rolleyes:
 

Kirk Keyes

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Aggie said:
Isn't the preservative in Dr. Pepper (the soda pop) ethylene glycol? I know in my colege chem classes, we all stopped drinking it after the professor showed us on the label that it contained antifreeze.

Ingredients:
Regular Dr. Pepper-
Carbonated Water
High Fructose Corn Syrup and/or Sugar
Caramel Color
Phosphoric Acid
Artificial and Natural Flavors
Sodium Benzoate (Preservative)
Caffeine

Diet Dr. Pepper-
Carbonated Water
Caramel Color
Aspartame
Phosphoric Acid
Artificial and Natural Flavors
Sodium Benzoate (Preservative)
Caffeine

No Glycols (unless they are included in the artificial flavors...)

Kirk - www.keyesphoto.com
 

Aggie

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Which state, I knowe they differed according to the laws of each state. AZ had the glycol in it
 

garryl

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Aggie said:
Which state, I knowe they differed according to the laws of each state. AZ had the glycol in it
Here in Texas it is the same ingredients. Also checked Coke- no glycols either. :confused:
 

garryl

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If it was used, what you may be remembering is Propylene Glycol--

http://www.atsdr.cdc.gov/tfacts96.html

The Food and Drug Administration (FDA) has classified propylene glycol as an additive that is "generally recognized as safe" for use in food. It is used to absorb extra water and maintain moisture in certain medicines, cosmetics, or food products. It is a solvent for food colors and flavors.
 
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