there are kinds of Agar(Agarose) with different quality for selection
Moisture ≤15% Undissolving in Water ≤1% Starch not blue Ash ≤2% As ≤0.0001% Heavy Metal(calculated by Pb) ≤0.004% PH 6.0-8.0 (1%) Gel Strength 900 g/cm2 min or 1200 g/cm2 min 1500 g/cm2 min Color from white to light yellow