Jerry and john_s:
You've convinced me! I'll be buying some 99% TEA from ChemistryStore this evening, and I'll adjust the developer formula.
And thanks for the postings about the interesting behavior of borates and buffering. The more I learn about chemistry, the more I appreciate how many things need to be determined (or at least verified) by experimentation.
Here's a modification of the TEA-based concentrate versus XTOL:
Notice the slight elbow at 1.5 on the X-axis. I've seen that before, and I suspect it's due to rotating developer in the tank developing the outside of the test-strip more than the center. So I'll be making baffles to stop movement of liquid and run more strips. As Michael R pointed out, we're down to such slight differences that a micro-densitometer is needed, and I don't want to distort things with uneven liquid-flow.
Here are crops of the latest TEA-type concentrate:
Xtol:bars-xtol90Lo.jpg, TEA con:bars-tea9xLo.jpg
Xtol:bars-xtol90Hi.jpg, TEA con:bars-tea9xHi.jpg
The densities aren't quite the same due to hassling with exposure on the scanner, but these should give you a good idea of the grain.
Last edited by albada; 07-31-2012 at 04:04 PM. Click to view previous post history.