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  2. Bromothymol blue - Wikipedia

    en.wikipedia.org/wiki/Bromothymol_blue

    Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances that ...

  3. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Solution: The main components of a universal indicator, in the form of a solution, are thymol blue, methyl red, bromothymol blue, and phenolphthalein. This mixture is important because each component loses or gains protons depending upon the acidity or alkalinity of the solution being tested. It is beneficial to use this type of universal ...

  4. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    pH indicators: a graphic view. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1]

  5. Bromophenol blue - Wikipedia

    en.wikipedia.org/wiki/Bromophenol_blue

    Bromophenol is also used as a colour marker to monitor the process of agarose gel electrophoresis and polyacrylamide gel electrophoresis.Since bromophenol blue carries a slight negative charge at moderate pH, it will migrate in the same direction as DNA or protein in a gel; the rate at which it migrates varies according to gel density and buffer composition, but in a typical 1% agarose gel in ...

  6. Simmons' citrate agar - Wikipedia

    en.wikipedia.org/wiki/Simmons'_citrate_agar

    The increase in pH then causes color change in the bromothymol blue indicator, turning it blue. Under neutral conditions the medium remains a green color. The color change to blue is useful because growth on Simmons' citrate agar is often limited and would be hard to observe if it were not for the color change.

  7. Here’s What Those Colored Circles on Food Packages Actually Mean

    www.aol.com/those-colored-circles-food-packages...

    They compare the color to boxes printed around the world to ensure consistent brand colors,” Schiraldi explained. “Most printers only use four colors: cyan (blue-green), yellow, magenta and black.

  8. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    In March, a mother was horrified to find a pedophile symbol on a toy she bought for her daughter. Although the symbol was not intentionally placed on the toy by the company who manufactured the ...

  9. Phthalein dye - Wikipedia

    en.wikipedia.org/wiki/Phthalein_dye

    Chemical structure of phenolphthalein, a common phthalein dye. Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH. [1]

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