More sketch book stuff...

Right: household emulsion and cif. Left: the effect of closing the page when it's still wet.

Right: white household emulsion, dirt embedded into it, and grass. Left: Yet again the effect, which I prefer. 

The effect of tinted wax being dripped onto the page then picked off.

Cream household paint and sugar.

Left: coffee grains, used tea bag, dirt and water. Right: Cling film, coffee, dirt, and chilli powder.