View Full Version : Active Chlorophyll
06-23-2013, 04:02 PM
Hello PE et al,
I have been reading about different methods of extracting chlorophyll from green vegetables to have a red sensitive dye that dose not cost over $600/g. I always use the bags of fresh baby spinach from the grocery. So far I have used isopropanol at 92% because it is widely and cheaply available. I have read of using acetone and heptane. I have also read of adding magnesium sulfate to the acetone. I am wondering, PE if you have experience or knowledge concerning extracting chlorophyll to be used as a red sensitizer.
Mustafa Umut Sarac
06-23-2013, 04:44 PM
China is your friend , I posted a free buying thread at www.alibaba.com and dyes costs 1/50.
06-24-2013, 11:46 AM
Mark Osterman uses Ivy for his source of red sensitizer. IDK what solvent he uses, but I do know that once extracted it does not keep well and the sensitivity it gives to film is very weak.
06-24-2013, 12:38 PM
If anyone is interested in a tested and working red sensitizer, SDA 3057 is $600/gram + convenience fee+tax+shiping. We did a 3 man order several months ago. I am the only guy who has run out again.. Anyone interested in a red sensitive dye that works, send me a private message. I believe that PE will confirm that this stuff works well. He is the one who put me onto it. Otherwise, I would not have a red sensitive emulsion at all.
06-24-2013, 12:44 PM
Why would Ivy be better than spinach, or any other green vegetation? They both would contain chlorophyll a and b.
06-24-2013, 12:51 PM
You could culture some chlorella if you're really ambitious :)
06-24-2013, 03:19 PM
The walls of GEH are covered in IVY! :D
IDK how you used that much sensitizing dye already. At about 40 - 60 mg / mole of silver that means that you have gone through a lot of silver.
06-24-2013, 11:13 PM
Because of the "j aggregation" thing I use considerably more Ag than that.. My earlier emulsions were 200mg/mole of silver. I have knocked that down to 150mg. It depends on grain size. But you were my guiding light in those days and my dye concentrations, accept for the reduction to 150mg, were at your advise.
Also, the last shipment of sda3057 was split 3 ways and shared with two younger guys well on their way to becoming like me.. I just 2 days ago advised one of them on choosing a species of mantis. My influence will live long after I am no more.
06-25-2013, 04:30 PM
I scewed up the first sentence! I intended to say 'I use considerably more DYE than that'.
06-25-2013, 04:34 PM
You should not need that much or you lose speed. See the table in my book.