Here are some images of my first exposure tests. This is 8% gelatin with 20mL isopropyl alcohol and 5mL of 1% alum. Poured at 0.035″ using magnetic strips as a dam. Gelatin was leveled with a heated 5/8″ rod.
Sensitized with 4% ammonium dichromate 1:1 with isopropyl alcohol (2% total) at 7mL total or 0.125mL/sq in. This amount seemed excessive for only a single coating.
There appears to be good detail at the 15 min exposure, but I will retest tomorrow with a more detailed negative at 12, 14, 16, 18, 20 min.
Exposure times 5-30 minutes:
Here is a closeup of the relief after soaking 30 min in clearing bath:
And here is the same image done in palladium on COT 320 paper using the exact same negative:
