Coffee is an interesting medium to paint. Coffee gives antique sepia effect in old and historical theme paintings.It gives natural shining.
(For different look some will add colors to coffee.)
Here I prepared with 100% pure coffee.
Required :
Coffee powder
Water.
Gold paint for outline for better look (if required)
Mix the coffee & water to get different shades.
Use less water to dark color and more water for light to lighter shade