Disparate Kodak Data / 400TMY and HC-110 (b)

[Dante_Stella]

Anyone ever catch that in F-4043 (2/2016), the times for TMY in large tanks with HC-110 don't actually match what is in the HC-110 instruction sheet (J-24, 12/2017)?

So look at TMY at 68 degrees in a large tank. In the TMY instructions, it's 6.25 minutes, and in HC-110, it's 7 minutes. That's not the only place/film where the numbers are different.

I'm a little curious about why Kodak's numbers are not cross-referenced (or even consistent). Different enlarger type assumed?

Also, why isn't everything standardized on large tank agitation? Slower agitation generally cuts back on the flow marks through the sprockets.

Dante

 

[Timmyjoe]

Hey Dante,

I might be nuts, but I thought I remember the formulation of HC-110 changing somewhat over the last decade. I can't remember the details, but I know I had some I bought in 2009 and being told that it was slightly different than the new stuff I bought in 2017. So maybe the numbers are different because the formula is slightly changed.

Best,
-Tim

 

[KenR]

Disparity? What disparity?

Disparity? What disparity?

I can't comment about the disparity between the two sources, but I know what works for me. My standard development of TMY400 is 11 minutes in HC110 at dilution H at 68 degrees in a Patterson 2 or 3 reel tank. Your mileage may vary - the only way to know is to test it out.