Knowledge is power!
The cyanide potassium is just from blue acid and makes...
Blue acid is a very volatile volatile compound, and dark nuts for it is not necessary, it is easier to get synthetically, and the cyanide sodium at 1 course in the inorganic laboratory is obtained, so there are no problems. And carbolic acid is nothing more than a phenol, and by chemical structure is not an acid at all. Transparent is not synonymous with colorless!!! In the characteristics of the reagent always write a transparent, red color, or transparent, slightly yellowish...The device for measuring something is a photocolorimeter, (FEC) on it measure the concentration of the substance of the colored solution, so that slightly yellowish or yellow is a big difference, while the solution remains transparent, otherwise the light will not pass through it. Exceptionally convenient for urine tests.