Odorless or almost odorless dark green crystals with bronze luster or dark green crystalline powder. pH (1% solution in water) 3 to 4.5 .
METHYLENE BLUE TRIHYDRATE(7220-79-3) is incompatible with strong oxidizing agents, caustics, alkali metal iodides and reducing agents. Also incompatible with dichromates. METHYLENE BLUE TRIHYDRATE(7220-79-3) forms double salts with many inorganic salts. Is bleached reversibly by (zinc + hydrochloric acid) or sodium hydrosulfite. In aqueous solution, this chemical is decolorized by zinc dust and dilute sulfuric acid, but the color is restored upon exposure to air and more rapidly upon addition of ammonium hydroxide.
Air & Water Reactions
Hygroscopic. Water soluble. Gives a blue solution in water.
Flash point data for this chemical are not available; however, METHYLENE BLUE TRIHYDRATE is probably combustible.
Dark green crystalline powder
Stain in bacteriology; reagent for several chemicals; as mixed indicator; as redox colorimetric agent. Targeting agent for melanoma.
Methylene blue is not an officially restricted drug. It is mainly used to control water mildew and small melon insects. It can replace malachite green. Methylene blue dissolved in water does little harm to fish. In addition, the drug has made achievements in many fields such as industry, medicine and skin care. Even the drug will be applied to more difficult cancer diseases. Methylene blue is more effective in the treatment of non advanced fish diseases. Methylene blue is an oxidant, which can oxidize nitrite into nitrate, inhibit and kill bacteria. However, it also has a certain impact on nitrifying bacteria, so some measures should be taken after use.
Methylene blue can be used in the manufacture of ink and lakes and the dyeing of biological and bacterial tissues. It can be used for dyeing cotton, hemp, silk fabrics, paper and bamboo and wood. It can also be mixed with crystal violet and yellow dextrin in the ratio of 78:13:9 to form alkaline magenta blue.