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** ph : 6.8
** memo : Boil 200 g peeled, diced potatoes in 1 L of tap water for 1/2 hour. Filter through cotton. Add 5.0 mg MnSO_4_. Adjust pH to 6.8. Make up volume to 1 L with tap water. Add 15.0 g agar. Melt, dispense and autoclave.
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