Keep it as is and include it in photo setups when you are testing film,
etc. After development, you can tell by the print what you need to know
to adjust development time or to use a different developer.

You're quite welcome.  

I hope the suggestion does work, as it just popped into my head in a
flash.  

I did something like this , but not exactly the same thing as I
suggested to you.  I  can't recall the details at this remove, but I
think I had to match up some grey scales in nagatives and prints for
control of some new, then, formulations using dye intermediaries as
developing agents.  The developers did work, but no improvement over
mainstream stuff.  The procedure gave me some basis for evauation
though.  I wish I had had some real densitometer and some step wedges,
instead of having to rig up makeshifts.

Let me know how it goes.  I may remember some details later.

Robert Vervoordt, MFA