Which type of substance is white in color when burnt after spraying cerium sulphate on TLC?

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Damaris Silveira

Some sesquiterpene lactones can present this kind of "negative spot".

Mehmet Boga

Thank you for your interestin. I don't knov which type sustance. They came last of methanol fractions on Silica gel column and they like crystal. I have four samples like this.

Robert Watson

Why not cerium oxide?

DRA Watson

Actually it is Cerium oxide in 10% sulphuric acid