dennis_oconnor6 Posted January 9, 2015 Share Posted January 9, 2015 <p>I decided I wanted to make some PC-Glycol 2 part developer. I found the following recipe.<br> Part A<br> Propylene Glycol 100ml<br> Ascorbic Acid (Vit C) 9g<br> Phenidone 0.2g.</p> <p>How ever when I added the Ascorbic Acid to the Glycol it would not totally dissolve. I even heated the glycol - same result.<br> I found on the www. that Ascorbic Acid solubility in Propylene Glycol = 1g in 20ml. That means for 100ml glycol I can only dissolve 5g of ascorbic acid. Which is about half that quoted in the formula. OR am I missing something?</p> <p>Dennis</p> Link to comment Share on other sites More sharing options...
peterbcarter Posted January 9, 2015 Share Posted January 9, 2015 <p>I have made several batches with this recipe. It does dissolve, but it does like to be warm. What form is your ascorbic acid? I use food grade powder.</p> Link to comment Share on other sites More sharing options...
Alan Johnson Posted January 9, 2015 Share Posted January 9, 2015 <p>I have also made this and it dissolved on heating as reported:<br> http://www.apug.org/forums/forum37/68513-would-pc-glycol-recipe-work.html<br> Be sure your Vitamin C is ascorbic acid and not sodium- or calcium- ascorbate also sold as Vit C.</p> Link to comment Share on other sites More sharing options...
dennis_oconnor6 Posted January 9, 2015 Author Share Posted January 9, 2015 <p>Thanks for your replies. I just checked and it is Ascorbic Acid (pharmaceutical grade Vitamin C). I have made the TEA version without any problems. I thought the idea of prop/glycol was that you did not have to heat it! What temperature are you heating it to? As hot as TEA?</p> Link to comment Share on other sites More sharing options...
Alan Johnson Posted January 9, 2015 Share Posted January 9, 2015 <p>It was some time ago but IIRC about 70C with continual stirring.I heat it in a stainless steel jug on a large metal hotplate to avoid a flash fire as discussed here:<br> http://www.photo.net/black-and-white-photo-film-processing-forum/00Bhk2?start=0<br> BTW metol is much harder to dissolve than phenidone unless the sulfite group on it is first reacted with a little TEA and water,the thread pre-dates Gainer's discovery of this.</p> Link to comment Share on other sites More sharing options...
dennis_oconnor6 Posted January 10, 2015 Author Share Posted January 10, 2015 <p>Thanks for the advice.</p> Link to comment Share on other sites More sharing options...
Fotohuis RoVo Posted January 13, 2015 Share Posted January 13, 2015 For our European readers maybe interesting that I am offering the PC-TEA from Patrick Gainer as ready made 50ml stock solution. "made in Ukraine" transported and distributed by Fotohuis the Netherlands. Now only keep the Russians out of that country! Link to comment Share on other sites More sharing options...
Fotohuis RoVo Posted January 19, 2015 Share Posted January 19, 2015 <p>http://www.photosensitive.ca/wp/easy-film-developers</p> <p>Without any problem. The <em>PC-TEA</em> is a very good type Ascorbic Acid developer. Fine grain, sharpness, almost like the old <em>Promicrol</em> from May & Baker.</p> Link to comment Share on other sites More sharing options...
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