Heck - nothin' to SO2. They work with it all the time at the Chevron refinery across town, and it has
only blown up once this summer, and doubled our gasoline price only for a couple of months. Things
are almost back to normal now.
This has already been done. Over on the Dye Transfer forum there's a fellow in Australia named Andy
Cross who precisely reverse engineered it, but he has access to true research lab facilities. It's a highly difficult product to duplicate, involving hazardous precursors. You can't do it in a home lab. Apparently Kodak no longer offers liquid developers in Australia due to hazmat shipping issues, so he
made himself a lifetime supply in a single batch. The concentrate allegedly keeps for decades. HC110
is still readily available here, so I don't know why anyone would even bother attempting to duplicate
it here, though I notice Freestyle claims to have an actual substitute.
iirc Kodak Australia doesn't import it, but we have no problem on having it shipped from the U.S. and receiving it. B&H has no problem sending it over.
I loved HC-110 with Tri-X before they reformulated Tri-X and the developing times for dilution B are now too short for roll film on a reel. I have always found the grain structure and shadow density produced by the TX/HC110B combo to be much more to my liking than D-76. Rodinol has wonderful qualities, but for me HC-110 was it.
Another thing about shelf life, I had someone give me bottles of very old HC-110. He said it worked fine. I saw a big difference in base fog, highlight separation, and D-Max areas when I processes a test roll (AKA a roll my wife shot). So it's shelf life is not infinite. Now that I got my old M2 repaired and fitted with a nice Summicron M lens, I'm playing with Tri-X in Rodinol, and T-Max 400 in HC-110B. Neither will be like the TX in HC-110. Sad face here.