Random PT/PD questions

[shinn]

1 What is the difference between K2PtCl4 and K2PtCl6 is one preferred over the other?

2 I’ve read an older thread about Ammonium Citrate with the Dichromate (in the dev) method and I’m wondering if anyone has tried this? And which dichromate would I use?

3 Does stain dry down…or would it be fog?

4 My PO developers are turning blue…is this normal? And it seems to be the two I have the most Pot dichromate in, while the two others are kinda green…I guess. All have a PH of 5-6.

5 Is Sullivan’s “cold bath developer” cold in tone or is it used cold and can this be used with dichromate in the dev?


Thanks in advance everyone.

Happy Days
Mark

 

[colrehogan]

The difference between the K2PtCl4 and K2PtCl6 is the oxidation state of the platinum. The B&S solution is the K2PtCl4, I believe. Dick Arentz mentions the K2PtCl4 when he describes the metal salts and how to make the solutions in his book.