I have left it folr months, come home it is almost black, put some in a bowl, add equal water and
flour. Let is sit a day or so, toss some, add equal flour and water, and repeat a time or two more till it is close to white. It is happy and bubbly and away we go!
I am in the hotel in Houston, take a shuttle to Galveston in the morning and then a launch out to ship. Should have wireless on board, so will be in touch.