Dissolved cellulose precipitates when the solution is acidified. The breath sample was then pumped through an acidified potassium permanganate solution. They decompose with sodium nitrite when acidified. One example is the reaction of oxalic acid with acidified potassium permanganate (or manganate (VII)). Then the extract is acidified, the dissolved dye precipitates and is washed. Oxidation can be achieved by heating the alcohol with an acidified solution of potassium dichromate. The resulting mixture is acidified with mineral acid. For example, menthone may be prepared by oxidation of menthol with acidified dichromate. SESI consist of an electrospray plume of pure acidified solvent that interacts with neutral vapors. In the laboratory, "l"-menthone may be prepared by oxidation of menthol with acidified dichromate. Then the acidified whey is heated to near boiling. Oils infused with fresh garlic or herbs should be acidified and refrigerated. Isocyanic acid, HNCO, is produced when a cyanate salt is acidified. Placing them in water slightly acidified with vinegar or lemon juice can prevent the discoloration. CDR is even slower to take effect on acidified oceans.