I've used tea but I've never thought of Guinness. Cool!
Jim, I accidently dribbled a bit on my sketch book once at a sessuin, then doodled the splat into a little man Coffee or tea work well for washes, even along with watercolor. Guinness is a bit sugary, so it'll leave a sheen on the paper in areas where you layer it on for the deeper tones. I usually condense it first, by leaving it in a small cup for a day or so, or even microwaving a bit. Not sure how this medium'll hold up over time, because of the sugars. I hope ants don't decide to chew on the drawings!
Originally Posted by auld argonian
Coffee or tea work well for washes, even along with watercolor. Guinness is a bit sugary, so it'll leave a sheen on the paper in areas where you layer it on for the deeper tones. I usually condense it first, by leaving it in a small cup for a day or so, or even microwaving a bit. Not sure how this medium'll hold up over time, because of the sugars. I hope ants don't decide to chew on the drawings! 
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