I found some old BD 500 which had been stored in my wine cellar for several years in a glass jar, with the lid on, but not sealed. Unfortunately it has dried out into a crumbly solid, no smell and no sign of mould. I would like to apply a BD 500 spray to a field which I am planting with cereal in the next moon cycle, and am wondering if I can revive the preparation. I had thought maybe to add some rainwater and let it sit in a warm dark place, and also maybe to add a pat of fresh cow dung, like one adds fresh flour to a soughdough starter. Does anyone have an opinion?