In a water bath, melt the marshmallows with the lemon juice and butter (stir all the time). As soon as the mass has become homogeneous, remove from heat and knead with a spoon in the same container. Begin to fill a teaspoon of the mixture (icing sugar 200 g mixed with potato starch 100 g) and stir the mixture, so far as possible, and then spread on the table dusted with mix and knead the dough until no longer stick to hands. Now paste Packed in polythene and 30 min in the fridge. in the photo half the mastic (since it is later decided to take photos)

I was left with 125 g of a mixture after mixing the putty. we need it for rolling mastic before making jewelry. But the fact that I have enough imagination.