OK, Ben...

Here's your answer and I'll break it down for you:

You want to end up with 32 oz of total fluid for your tray, made up of 2 oz stock solution and 30 oz water. You mentioned that you would like to use your favorite dilution of 1 (stock solution) : 15 (water).

Since HC110 stock is made of 1 part concentrate and 3 parts water (1:3 ratio), let's use this to come up with our 2 oz of stock, which will make it very easy.

1/2 oz concentrate PLUS 1 1/2 oz water EQUALS 2 total oz of stock solution.

Adding 30 oz of water to the 2 oz stock solution EQUALS 32 oz working solution to use in your tray.

1/2 oz EQUALS 14.78 ml. This is how much raw concentrate is in your dilution.

It takes 3ml of HC110 (in any dilution) to process 80 sq inches of film.

So, your dilution will be able to process just under 5 sheets of 8x10.

To tell the truth I'd probably add a hair more stock solution to my final working solution and call it a day...close enough.

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You are essentially using Dilution H, an unofficial dilution, which is 1:63 from concentrate. I always use this dilution with roll film and sheet film, mainly with TXP 320.