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Food plants rich in anthocyanins include the blueberry, raspberry, black rice, and black soybean, among many others that are red, blue, purple, or black. Some of the colors of autumn leaves are derived from anthocyanins. [1] [2] Anthocyanins belong to a parent class of molecules called flavonoids synthesized via the phenylpropanoid pathway.
The juice of red cabbage can be used as a homemade pH indicator, turning red in acid and green/yellow in basic solutions. When cooking, red cabbage will normally turn blue; adding vinegar or acidic fruit to the pot is necessary to retain the cabbage's red colour. [4] Red cabbage needs well-fertilized soil and sufficient humidity to grow.
[1] In its deprotonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium, magnesium, or other metal ions. EBT is blue in a buffered solution at pH 10. It turns red when Ca 2+ ions are added.
It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]
Calconcarboxylic acid (IUPAC name 3-hydroxy-4-[(2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl]naphthalene-2-carboxylic acid; commonly called Patton and Reeder's Indicator) is an azo dye that is used as an indicator for complexometric titrations of calcium with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium. [2]
FADH 2 can also be oxidized by the loss of 1 H + and 1 e − to form FADH. The FAD form can be recreated through the further loss of 1 H + and 1 e −. FAD formation can also occur through the reduction and dehydration of flavin-N(5)-oxide. [8] Based on the oxidation state, flavins take specific colors when in aqueous solution.
Two urns containing white and red balls. In probability and statistics, an urn problem is an idealized mental exercise in which some objects of real interest (such as atoms, people, cars, etc.) are represented as colored balls in an urn or other container.
Janus Green B is a basic dye and vital stain used in histology.It is also used to stain mitochondria supravitally, as was introduced by Leonor Michaelis in 1900. [2]The indicator Janus Green B changes colour according to the amount of oxygen present. [3]