i brought a 50 pound bag of play sand a while ago but i have used it yet because i did'nt know if it was safe to use because from a few reports they said that it could be alkaline , too bad i can't find silica sand localy here . anyways , the sand is from the quikrete company . the sand looks whitishish grey . on the see through back it says " 50 pounds of pure fun " and " kiddies fun play sand " in red and green letters with a drawing of a kid playing in a sand box . it also says " ideal for building and molding " " screened , washed , dried . so if anybody is uiseing this sand with there cps safely then please tell me .