If you are new to letterpress like me, you are probably starting to feel crushed by the expense. (Hmm, subject of a future post, or too depressing?) One pound of ink can be between $10 and $25 depending on the type and the color, plus you will probably have to pay for shipping unless you can find a local retailer. If you are feeling adventurous, contact David Churchman (email under Links That I Like). He is a proprietor of new and secondhand letterpress equipment in Indianapolis and will sell you partly used cans of ink for $1 per pound. I asked for $5 worth and got a selection of red, two blues, green, and mauve. On his advice, I purchased new cans of black and opaque white.
You can also mix your own colors. A white surface is the best surface to work on; the colors stay true and undistorted. I use a transparent rectangle of glass with a piece of white paper underneath. Have as many clean ink knives on hand as the number of inks you plan to mix. Combine small amounts of dark ink into the light ink until you are satisfied with the result. Keep in mind that a little ink goes a long way. The disk on the Pilot Press, which is 11 1/4 inches across, can be fully covered with less than a teaspoon of ink.

I made some pink ink for note cards.