One of the great things about metal clay is that there is no waste. Even if your clay dries out completely you can reconstitute it back to workable state. Here I have outlined the method I use for reconstituting my clay - I'll talk through it step by step.* Put all your dried clay into a pestle and mortar and grind it right down.
* This part isnt photographed - but pour your dust into a glass and get a stocking and pull it as tight as you can over the neck of the glass and SIEVE the dust back into the pestle and mortar. (Do this over a large piece of paper to allow you to catch any wayward clay that does not sieve where you want it to - just pour back in once you are done).
* Now you should have separated the fine power from any lumps which will be left behind in the glass.
*I take a double layer of clingfilm and depending on how much clay I am working with pop it into a little pot or dish.
* SLOWLY add water drop by drop and mix in to the powder. And Mix it all up.
I added a little too much water here so its sitting next to me open and as it dries a little I'm giving it a massage and folding the dried parts on the outer parts of the cling film INTO the clay. By tomorrow I should have a nice big ball of clay to play with. I'm a lazy reconstituter - it comes from the habit of just sticking holes into a lump of clay, adding water, covering and leaving it for a while, massaging, adding more water etc - It could take DAYS! So I dont mind that this method takes a day. I'm hoping it will be ready for me to use tomorrow.