510 Pyro Vorsprung Durch Technik

[GoodOldNorm]

Interesting blog on 510 Pyro

http://experimentelle-fotografie.blo...ntwickler.html

This has been translated from German to English by Google.

I tried 510 Pyro a while back I got results very similar to Pyrocat HD. Measuring the correct amount of Phenidone can be problematic if you do not have accurate scales. If anyone has used 510 Pyro I would be interested in your opinions. I found it very hard to dissolve all the chemicals when mixing it up, I may try Ruediger's method as described on his blog. I had problems getting full shadow detail at box speed with the original 510 Pyro with 0.25g phenidone, will increasing the phenidone to 0.375g give a speed increase?

[Stocky]

I found that it took a while to dissolve, but it did eventually. Like you Norm, I found shadow speed to be distinctly low, significantly lower than with Pyrocat.

[Mark J]

I saw John Finch mixing some up on Youtube the other night. Interesting that he warmed it up to 80°C.

I haven't quite understood yet how 510-Pyro works, when compared to other Pyro formulae. There is no alkaline 'B' solution, and I thought this was necessary to 'activate' the developer and create the staining ?

[Nat Polton]

Originally Posted by Mark J

I saw John Finch mixing some up on Youtube the other night. Interesting that he warmed it up to 80°C.

I don't know what chemistry equipment you have. I made my first batches using a 1 litre pyrex beaker that stood on a sand bath. The sand bath was stood on the kitchen stove with the extractor hood on full extract.
WARNING. Pyro and domestic kitchens are to be frowned on for health reasons.
I eventually purchased A HEATED MAGNETIC STIRRER.

The comparisons of developers and testing for real film speed by John Finch on his youtube channel Pictorial Planet are well worth looking at.

Cheers.

[Lostlabours]

Originally Posted by Mark J

I saw John Finch mixing some up on Youtube the other night. Interesting that he warmed it up to 80°C.

I haven't quite understood yet how 510-Pyro works, when compared to other Pyro formulae. There is no alkaline 'B' solution, and I thought this was necessary to 'activate' the developer and create the staining ?

TEA become alkaline when mixed with water. One of the majot issues with TEA is it is extremely viscous at room temperature and almost solid below 20ºC.

Ian

[Mike O'Pray]

I have never used either but having read many reports by users on this and other fora, the balance of opinion seemed to favour Pyrocat HD as the better developer

Mike

[Lostlabours]

Originally Posted by Mike O'Pray

I have never used either but having read many reports by users on this and other fora, the balance of opinion seemed to favour Pyrocat HD as the better developer

Mike

Pyrocat HD is a superb developer, you have seen quite a lot of my work made using it Mike, when I gave a second talk yo East Midlands Monochrome.

It's been my main developer since around 2005, results are so consistent, easy to print.

Ian

[Mark J]

It's OK Nat, I've been using PMK pyro for 25 years, i don't think I'm going to try 510, I was just interested in the difference. Thanks for the info Ian.
You can mix PMK OK in a kitchen, you just have to clear some space, keep tabs on any spillage and clean up afterwards. i wouldn't want to do it with kids around though !

[Keith Tapscott.]

I have just found this thread and there is a pyro formula designed by Patrick Gainer.
Is this where the idea for 510 Pyro came from?

See the end post.

https://www.photo.net/forums/topic/3...hp5-plus-film/

[Mike O'Pray]

Originally Posted by Keith Tapscott.

I have just found this thread and there is a pyro formula designed by Patrick Gainer.
Is this where the idea for 510 Pyro came from?

See the end post.

https://www.photo.net/forums/topic/3...hp5-plus-film/

My understanding is that 510 was the brainchild of someone called Jay de Fehr but Ian is probably a better source on such matters

Mike