I have a few prune plums slowly turning into prunes on the ground so thought I would make a solar drier to slightly enhance the drying. So it is just white shade cloth above and black landscape fabric below and about 2 inches (5 cm air gap). The air and moisture from plums should easily pass through either the black fabric or white fabric. and the plums do get hot underneath the white shade cloth. Please try it. I recommend keeping the black landscape fabric no matter what and try different covers. Maybe, glass, or plastic or mosquito net. The idea is to make solar drying as cheap and "dumbed down" as possible so that even a guy like me can do it. on a big scale. Big scale is really important. Thousands of tonnes of fruit rot on the ground every year. I also want to dry apple slices . Hopefully the cloth will keep out bugs.