I hace 3 stones, a 1000, a 6000 and a 10 000 which all came in cradbord boxes, I can't say what type of stones they are because I cant read Japaneeze. However, I put them away wet in their cardboard boxes and they grew mould! now that I have thrown out the boxes and scraped off all the red and green fuzzy stuff growing on them I need to know the proper way to store them. Any suggestions?