Check the listing for details. Sodium Thiosulfate, Reagent, Fine Crystal, 99.5% min., 500 grams. Condition: New – Open box. Listed at 17.95 USD. You are bidding on 500 grams of Reagent grade Sodium Thiosulfate, Pentahydrate (Fine/Small Crystals). Purity is 99.5% minimum. YOUR SAMPLE will come from a 50 kg drum. Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! Shipping will comply with all USPS regulations. Item is NOT regulated by the DOT.You are bidding on 500 grams of Reagent grade Sodium Thiosulfate, Pentahydrate (Fine/Small Crystals). Purity is 99.5% minimum. YOUR SAMPLE will come from a 50 kg drum. Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! Shipping will comply with all USPS regulations. Item is NOT regulated by the DOT.