• Welcome to Photrio!
    Registration is fast and free. Join today to unlock search, see fewer ads, and access all forum features.
    Click here to sign up

Still Crazy After All These Years: Revisiting PMK Pyro

Milpool said:
Alternatively instead of making a stock B solution you can simply mix as you go. Suppose you need a liter of working developer solution. Dissolve 6g sodium metaborate into 990ml water, add the 10ml of part A. Done.
Click to expand...

I didn't think of doing this...thanks for the suggestion. Not sure why I didn't think of it, since I do this regularly with the Part B of ABC Pyro.
 
Alan9940 said:
I didn't think of doing this...thanks for the suggestion. Not sure why I didn't think of it, since I do this regularly with the Part B of ABC Pyro.
Click to expand...

I'm with you Alan and will mix my "B" just before I make my working solution. Certainly not that hard to do!
 
John Wiegerink said:
Me too Paul, but I always mixed the "B" as concentrate before and will now mix "B" as needed just before development.
Click to expand...

If you’re mixing from scratch you could also choose to make a more dilute B stock if you have any trouble with the more concentrated stock. Say for example you make the stock B half as concentrated. Then you just need to use more of it to make the working solution. As long as the final working PMK solution has a concentration of 6g of metaborate per liter it doesn’t matter how you get there.
 
retina_restoration said:
I make it from scratch, using the raw chemicals from ArtCraft.
Click to expand...

Yeah, I mix all the formulas I use from raw chemicals. But, I've pretty much always had an issue getting all the sodium metaborate into solution, since it's such a concentrated solution. At one point, I thought of just buying a bottle of Part B from Bostick, but somewhere along the way I moved on to other pyro formulas.
 
Milpool said:
If you’re mixing from scratch you could also choose to make a more dilute B stock if you have any trouble with the more concentrated stock.
Click to expand...

This is what I eventually wound up doing but, for whatever reason, I didn't find even the half-strength easy to mix. I'm definitely going to give your 6g per L a try and see how I get on with that.
 
TXP 4x5 in PMK Pyro. It takes a full 10 minutes to go from -1/2 to +1/2 with CI 0.56 in the middle. It's hard not to be in the ballpark.



3 CI vs Time curves. PMK Pryo, PMK Pyro read with blue channel, Xtol.

 
Last edited:

How was this done? Continuous agitation? Open tank? Closed tank, hand agitate?

I have some skepticism that you can get to 20min without severe oxidation and loss of developer activity, but I'm willing to get schooled here...
 
chuckroast said:
How was this done? Continuous agitation? Open tank? Closed tank, hand agitate?

I have some skepticism that you can get to 20min without severe oxidation and loss of developer activity, but I'm willing to get schooled here...
Click to expand...

The data comes from an unfinished project I worked on with a partner. I didn't do the processing, but here are the notes.

 
Last edited:
You must log in or register to reply here.
Menu
Log in
Register