Blank film

HiHoSilver said:

35mm?! Ohhh. That stands with some very very tall shooters in my book.

When I search UN54, all I see is 16mm & that's sold out. Has this been a regular for you? Is there a reliable source for it?

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Picked up 400' from Orwo NA. George is a great guy to deal with. They also do 100' rls as well.

'Spoke w/ Formulary today & they agreed that separate syringes are in order - and that even putting the wrong bottle cap on a bottle was enough to contaminate. Much to my surprise, the local Ace hardware pharmacy had 3ml graguated syringes for $0.25 each (over $4 from formulary). 'Got one for part B, HC-110 & Rodinal. 'Will put w/ each bottle by rubber band.

HiHoSilver said:

Got one for part B

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Make sure you get 1 for part A also. I even mix my PCat @ different counters as well. The only time they can see each other is when I store them together in the cupboard. Even then they are in light proof bottles ;o)

'Using my existing syringe for 'A', got one for 'B', Rodinal & HC-110. Each soup gets its own syringe. Its amazing, that level of sensitivity, but if that's the nature of the beast - they all get their own - esp. when Ace has them so cheap. I appreciate the kind help, Dances.

When you get down to very high dilutions, and 1:1:240 most certainly fits this category, the rate of aerial oxidation becomes a problem. Any delay in use after mixing can cause loss of activity. That can be a serious problem with these developers and cause inconsistent results. In addition the long development times for stand and semistand development certainly do not help things. Even the oxygen in the water used for dilution can destroy some of the developing agents. The recommended dilution is 1:1:100 and I would suggest sticking with that. Read the article in unblinkingeye.

http://www.pyrocat-hd.com/

http://unblinkingeye.com/Articles/Pyrocat/pyrocat.html

HiHoSilver, the only time I saw blank film, was when Part B was not mixed in. I made that mistake once and never again!

juan said:

I have seen the B solution go bad. As a result, I compute the amount of sodium or potassium carbonate needed for a given volume of working strength developer and mix the dry chemical directly into the water. In your situation I would add 2.5g of carbonate to the 600ml water. While this method means I have to get out the scales each time I develop, I eliminate cross contamination and the less likely possibility of the B solution going bad.
Juan

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Wow, really? I've never seen part B go bad, and I've used stock solutions that are going on two years. It should last indefinitely.

Gerald & Andrew - I appreciate your help.

I suspect my part B was below the mouth of the syringe & I didn't notice. Formulary solves it by adding a length of tubing to the syringe. I also bought syringes enough to dedicate one to each of my one shot developers.

'Very much appreciate your help, Gents.