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Mayer 's reagent is an alkaloidal precipitating reagent used for the detection of alkaloids in natural products .. reagent. reagent. alkaloids. alkaloids. Mayer 's reagent is freshly prepared by dissolving a mixture of mercuric chloride -LRB- 1.36 g -RRB- and of potassium iodide -LRB- 5.00 g -RRB- in water -LRB- 100.0 ml -RRB- .. reagent. reagent. mercuric chloride. mercuric chloride. potassium iodide. potassium iodide. Most alkaloids are precipitated from neutral or slightly acidic solution by Mayer 's reagent -LRB- potassiomercuric iodide solution -RRB- to give a cream coloured precipitate .. reagent. reagent. alkaloids. alkaloids. potassiomercuric iodide. Potassium tetraiodomercurate( II ). This test was invented by the German Chemist , Julius Robert Von Mayer -LRB- 1814 -- 1878 -RRB- .. Julius Robert Von Mayer. Julius von Mayer