I was wondering if anyone had some advice for winter printing in Pt/Pd. I was hoping to try my hand at the Na2 method in a bit. My problem is that my "darkroom" is half of my basement and this time of year in the Frozen North, the relative humidity in my house is below 30%. Last year winter when I was doing kallitypes I experienced some graininess in many prints and I am pretty sure it was related to low humidity.

I could try a humidifier, but I am not sure how effective that would be in a 30'x16' basement area that is not tightly sealed. I could construct a humidification chamber of some sort, but am not quite sure how best to do that or whether it would be ideal.

Has anyone successfully dealt with a similar predicament?