Ammonium Persulphate   Stock #: 440026 Price: $17.95 Quantity: Quantity in Basket: none BUY IN BULK! Quantity: 3-99999 Price Each: $16.19 SAVE MONEY! Economical! KELVIN©'s Ammonium Sulphate Etchant powder features an indefinite shelf life. Mix with water as needed; 4 lbs. makes up to 2 gallons of 20% solution. 4 lbs.

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