Thymolphthalein is an acid-base (pH) indicator. Its transition range is at approximately pH 9.3-10.5. Below this pH, it is colorless; above this pH, it is blue. Its molecular formula is C₂₈H₃₀O₄.  pH indicator The correct title of this article is pH indicator. ... An acid (often represented by the generic formula AH) is typically a water-soluble, sour-tasting chemical compound. ... The common (Arrhenius) definition of a base, also known as an alkaline compound, is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... The title of this article is shown beginning with a capital letter due to technical restrictions. ...  pH indicator The correct title of this article is pH indicator. ... The title of this article is shown beginning with a capital letter due to technical restrictions. ... For other uses, see Blue (disambiguation) Blue is one of the three primary additive colors; blue light has the shortest wavelength range (about 420–490 nanometers) of the three additive primary colors. ...

Structural formula of thymolphthalein

It can be used to make a disappearing ink. Dissolve the thymolphthalein in alcohol solution and add sodium hydroxide (NaOH) dropwise until it turns blue. It can then be sprayed onto cloth. After several minutes, it will turn colorless. (Carbon dioxide from the air will react with the basic solution. When the pH drops below 9.3, the thymolphthalein turns colorless.) Such inscription can be turned visible again by submerging it in liquid of pH higher than 10,5. Structural diagram of thymolphthlalein pH indicator File links The following pages link to this file: Thymolphthalein Categories: User-created public domain images ... Structural diagram of thymolphthlalein pH indicator File links The following pages link to this file: Thymolphthalein Categories: User-created public domain images ... An ink is a liquid containing various pigments and/or dyes used for colouring a surface to render an image or text. ... In general usage, alcohol (from Arabic al-ghawl الغول) refers almost always to ethanol, also known as grain alcohol, and often to any beverage that contains ethanol (see alcoholic beverage). ... Flash point non flammable Supplementary data page Structure and properties n, εr, etc. ...