Pt Solutions

[Annie]

I am working on my Alt shopping list.... could someone please tell me the difference between the two solutions listed that contain platinum on the B&S site.

1. Sodium Chloroplatinate 20% solution
2. Potassium Chloroplatinite Sol. No.3 (a standard mix for platinum prints)

Is the Sodium Chloroplatinate the solution that is used instead of the #2 Ferric Oxalate solution for contrast control? If so how much should be ordered for every 100ml of Pt Sol. No.3.

Thanks

 

[Jorge]

Yes Anie, Sodium Chloroplatinate is used to increase contrast in the print. Since is forms part of the image instead of restraining the reducing accion it gives better results than using the evil #2 solution, but be very careful, the platinate is very powerful, most people dilute it to 10% and even 5% at 20% I would not reccomed it for an 8x10 print, 1 drop will probably cause too much contrast. BTW if you use platinate as contrast control, you will have to increase your printing times.

The one you want to make coating solution is Potassium Chloropaltinite.

 

[Annie]

Thanks Jorge... I will get a jug of the coater and a wee bottle of the contrast agent.

 

[wm blunt]

Annie,
You might want to check out the web site of Dick Arentz, he has a section on using the NA2 contrasting agent.
Wm Blunt

 

[Jorge]

William, do you have the URL, I have never seen his site.

Never mind, Found it!

 

[wm blunt]

oops,

I meant www.dickarentz.com

Wm Blunt

 

[Annie]

Yikes! The confusion continues...on Dick Arentz's site all references to NA2 are for Palladium not Platinum. Does the same data apply to Platinum?

 

[wm blunt]

Annie,
I believe those using NA2 are not using any other platinum in the solution. The NA2 becomes part of the image along with the palladium. The more NA2 used to boost contrast the cooler the image becomes, somewhat like adding platinum. I use potassium oxalate dev. with dichromate for contrast control and use very small amounts of NA2 to kind of tweek the contrast. I thought I really came up with something new until I went to APIS this year and found out many people were doing the same thing.
Wm Blunt

 

[Don Bryant]

Yes Anie, Sodium Chloroplatinate is used to increase contrast in the print. Since is forms part of the image instead of restraining the reducing accion it gives better results than using the evil #2 solution, but be very careful, the platinate is very powerful, most people dilute it to 10% and even 5% at 20% I would not reccomed it for an 8x10 print, 1 drop will probably cause too much contrast. BTW if you use platinate as contrast control, you will have to increase your printing times.

The one you want to make coating solution is Potassium Chloropaltinite.

NA2 can be successfully used when making 8X10 or smaller prints, it just needs to be diluted with distilled water. Add 1 drop of distilled H20 to the 20% NA2 to get a 10% solution and so on. Assuming that a drop has a volume equal to 0.05 ml then a 2:1 mix will yield about a 3% solution if I've done mu arithmetic correctly.

Good luck,

Don Bryant