Zwikker / Dille-Koppanyi reagent
Cobalt salt (nitrate or acetate) plus isopropylamine. Violet to blue-violet colour with barbiturates. Workhorse barbiturate screen since the 1940s.
Cobalt salt (nitrate or acetate) plus isopropylamine. Violet to blue-violet colour with barbiturates. Workhorse barbiturate screen since the 1940s.
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