Note 25 bis — Chapter XXIV · COPPER, SILVER, AND GOLD
George Kamensky translation
In order to determine when the reaction is at an end, a few drops of a solution of K2CrO4 are added to the solution of the chloride. Before all the chlorine is precipitated as AgCl, the precipitate (after shaking) is white (since Ag2CrO4 with 2RCl gives 2AgCl); but when all the chlorine is thrown down Ag2CrO4 is formed, which colours the precipitate reddish-brown. In order to obtain accurate results the liquid should be neutral to litmus.