Why is the colour of carbonized-mixture of biochar and potassium hydroxide white?

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Paul Milham

You probably removed all the C and melted the KOH. The KOH may have also reacted with CO2 to form the carbonate. Liquid KOH dissolves SiO2 which I'm guessing the crucible was composed of

Ezhumalai Sedhuraman

I have used the same synthesis route 800 degrees, 1:3 Ration, and 5 degree/Min ramp. I obtained my resultant product at Greenish white after washing it with HCL and DI water. Wasiu Makinde