Not all of them are dry. They have a line of pigment concentrate dispersions. They call them "color paste". They're either aqueous or glycol dispersions, depending on the pigment.
Synthetic Organic Pigments:
Thinking about trying at least the lamp black once I run out of watercolor. $9 for 75 grams ($25 for 250g / $60 for 1kg and you're set for life!)