Hydrogen peroxide in Pt/Pd solution

[jos__miguel_ferreira]

Hello,

 

I hope this is the right forum to ask this question.

 

Yesterday I used 1 drop of 3% hydrogen peroxide in the Pt/Pd solution (5 and 15

drops, respectively) to try and "snap" highlights a bit. I had tried another

print with a drop of solution B just before, but didn't like the results (it had

grain even with one single drop, and the shadows weren't that great).

 

I liked the results with 1 drop of 3% hydrogen peroxide, except for the brush

marks that appeared all over the print once the print was in the developer. This

was the first time I saw the effect, and it was also the first time I used

hydrogen peroxide, so I guess they're connected. The brush marks (a bit watery

in aspect) did not disappear in the hot potassium oxalate developer, and neither

in the clearing baths. Is it necessary to dilute the 3% hydrogen peroxide, or

use more of it (2 drops) ?

 

Did anyone ever had this problem?

 

Thank you for any useful feedback,

 

José

[jdrose]

I cannot answer your question, although I have had experience with Pt/Pd printing. You are likely to get an answer here, but if you do not, try the B/W Film Processing forum, Alternative Folder.

[jorge_gasteazoro6]

Streaks can be caused by other reasons. Did you humidify the paper before coating? If you are using a hake brush, did you use it wet? Peroxide should not be a cause for streaks, and most likely is due to the brush.

 

If you are using hake brushes, I recommend you switch to the Richeson 9010 brush. This brush is used by water color painters to spread water on their paper and it is excellent for spreading the pt/pd solution.