Phosphorous acid

       CAS NO:13598 -36-2

       Appearance: white crystal

Monopotassium phosph...

       CAS NO:13977 -65-6

       Appearance: white crystal

POTASSIUM PHOSPHITE

       CAS NO:13492-26-7

       Appearance: Colorless to yellowish transparent liquid

Iminodiacetic Acid

       CAS NO:142-73-4

       Appearance: white crystal