With the arrival of fall, I'm finally getting around to doing some of those tests that we all promise ourselves to do - someday. I wanted to arrive at a standard time for toning, so I made five identical prints on Oriental Seagull #2 fiber based paper, then processed all of them the same except that one was left untoned and the remaining four were toned for varying periods from 2 minutes to 6 minutes. Here's the precise process I followed:

Develop (Dektol 1:2) 2 min
Water (not stop bath) 1/2 min
Fix 3 min
wash/hold
Plain hypo 3 min
Selenium toner 1:15 with a little balanced alkali - varied times
Kodak Hypo Clearing Agent 3 min
wash

There was no rinse between toner and HCA. As soon as I put the prints into the HCA, a orangish/sepia precipitate started to form which eventually has stained the fibre base. This has occured to me before and seems to usually happen when the toner and HCA are fresh.

Can anyone explain this and suggest how to stop it?

I'm familiar with Ansel's method of mixing the toner and HCA together, but have read conflicting reports about the efficacy of that approach, so have tried to standardize on the separate baths.

Many thanks for any suggested fixes.