Black Iron Oxide - Fe3O4 - Natural - 5 Pounds $19.99 B004KICAVU
Non-GMO Project Verified Citric Acid - 10 Pounds (2-5 lb bags) - Organic, 100% Pure - Alpha Chemicals $26.99 B006ST67F4
Non-GMO Project Verified - Citric Acid - 5 Pounds - Organic, 100% Pure - Alpha Chemicals B006STCVL8
Non-GMO Project Verified Citric Acid - 1 Pound - Organic, 100% Pure - Alpha Chemicals B007ZYXPJM