I have started using Revere Platinum paper for Kallitype prints.
This paper has a beautiful soft, smooth surface and coats easily.
But... all my prints have a yellowish stain evenly throughout the paper.
The emulsion is equal drops of Ferric Oxalate 20 percent and Silver Nitrate 10 percent
I am developing in Sodium Citrate 20 percent
Rinsing and clearing in Citric acid 3 percent
Toning with a palladium solution made with .5 percent citric acid.
Fixing in Sodium Thiosulfate
I would appreciate any feedback on how I can deal with the staining.

Thank you.

Michael.

Thanks for reaching out and for choosing Revere Platinum. We’re glad to hear the paper is coating well and that you’re enjoying the surface, though we're sorry you’re running into the yellow staining.

A uniform yellow cast across the sheet typically points to residual iron salts that aren’t fully clearing, rather than a paper defect. Revere Platinum is internally and surface-sized specifically for alternative process printing, and it’s widely used for Kallitype, Argentotype, and Pt/Pd without staining, so the issue is almost always chemistry-related.

Here are a couple suggestions that usually resolve the problem:

1. Strengthen or extend your clearing sequence

Citric acid at 3% can sometimes be too mild for Kallitype. Some printers we asked get better clearing using:

EDTA Disodium (2–5%),

EDTA Tetrasodium (2–5%),

or a two-bath clearing system (e.g., Citric → EDTA → fresh water rinse).

If you prefer to stick with citric acid, try increasing the concentration to 5% and extending clearing time.

2. Confirm sufficient wash time

Residual ferric oxalate can remain if the wash is too short or if water isn’t circulating well. Ensuring a thorough wash after fixing (typically 10–15 minutes) often eliminates yellow staining.

Hopefully, one of these two solutions fixes the issue. Please let us know how you make out.