Salkowski reagent preparation?

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Metwally Ramadan Kottb

Perchloric acid 35% is better than sulfuric acid

Wendesen Melak Tesema

Salkowski's reagent originally prepared with sulphuric acid has a short life span. It needs to be read the sooner the pink color forms when read in a spectrophotometer(530nm), but when perchloric acid is used, it can stay stable before the color fades, for a few hours with stability.