I can make it change color without using dye by a process of iron oxidation.

Alkali metal reduction Base catalysed decomposition (BCD) Catalytic hydro dechlorination (CHD) Gas phase chemical reduction (GPCR) Photochemical dechlorination (PCD) and catalytic dechlorination (CD) reaction Plasma arc Potassium tert Butoxide (t BuOK) method Supercritical water oxidation (SCWO) and subcritical water oxidation

Researchers (including at my laboratory) have investigated how the body naturally handles the occasional release of hemoglobin from aging red blood cells and from cells affected by blood diseases, such as hemolytic anemia. They have found that the body s first line of defense against hemoglobin oxidation is a process of reduction, in which molecules like uric acid or ascorbic acid (vitamin C) impede oxidation by reducing the iron to a less oxidizing species.

Now, if it does not decay biologically, it shifts to oxidation, which is a very slow process, and this smothers and kills grasses, leading to a shift to woody vegetation and bare soil, releasing carbon.

Outside of red blood cells, good ferrous iron the only oxygen carrying form is oxidized uncontrollably to form the bad ferric and ugly ferryl forms of hemoglobin. When released into a person s circulatory system, hemoglobin in these higher oxidation states eventually self destructs, damaging molecules in surrounding tissue.