Dan is right . . the Silver Rag has a lovely surface. I've just gone through 500 large sheets of it and at Dan's suggestion went to my 1920's Kodak
Velox transparent water color stamps, which are water colors on tearable sheets of paper. I use drugstore 70% isopropyl alcohol with this so it will dry quicker. Using water wets the emulsion too much and it dries slower.Even if you use a hair dryer to speed drying it can sometimes leave an obvious flat spot. So, I tried applying color to Silver Rag edge of a print and it goes on nicely.
Another tip is to take your empty cartridges and drain them into a bottle w/an eye dropper, which are sometimes available in the pharmacy of a good drug store for about $1 each. They do go into the paper but, surprisingly, not quite as easy as the water colors.
Do you want a semi gloss/luster surface that resembles an air–dried F-surface silver print or would a matte surface be more to your liking?
If the former, you might try Crane Silver Rag. It has a beautiful surface with no surface bronzing with the K3 inks. How it will take hand–applied colors is anyone's guess.
Good luck with your project!