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  2. Correction fluid - Wikipedia

    en.wikipedia.org/wiki/Correction_fluid

    Correction pen. A correction fluid is an opaque, usually white fluid applied to paper to mask errors in text. Once dried, it can be handwritten or handdrawen upon. It is typically packaged in small bottles, with lids attached to brushes (or triangular pieces of foam) that dip into the fluid. The brush applies the fluid to the paper.

  3. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Universal indicator. A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution. [1]

  4. Liquid Paper - Wikipedia

    en.wikipedia.org/wiki/Liquid_Paper

    Liquid Paper. Liquid Paper products at The Women's Museum in Dallas, Texas. Liquid Paper is an American brand of the Newell Brands company marketed internationally that sells correction fluid, correction pens, and correction tape. Mainly used to correct typewriting in the past, correction products now mostly cover handwriting mistakes.

  5. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    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] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...

  6. Acidic paper - Wikipedia

    en.wikipedia.org/wiki/Acidic_paper

    Acidic paper is paper which was manufactured using acidic substances. [1] Widely used since the mid-nineteenth century, its pages become yellow within years, extremely brittle over decades, and eventually unreadable in the library and archive collections intended to perserve them. [2] This process has been called "slow fire".

  7. Chemical Agent Detector Paper - Wikipedia

    en.wikipedia.org/wiki/Chemical_Agent_Detector_Paper

    The paper typically change color in the presence of a chemical agent. The U.S. Military and first responders typically use the paper. M8 Detector Paper Starting from the left, the image includes the booklet of M8 testing paper (with accompanying testing legend), a testing vial, and a sample of used M8 Chemical Agent Detector Paper.

  8. Thermochromism - Wikipedia

    en.wikipedia.org/wiki/Thermochromism

    One example is the paper impregnated with the solid mixture of a fluoran dye with octadecylphosphonic acid. This mixture is stable in solid phase; however, when the octadecylphosphonic acid is melted, the dye undergoes a chemical reaction in the liquid phase, and assumes the protonated colored form.

  9. Wite-Out - Wikipedia

    en.wikipedia.org/wiki/Wite-Out

    The trademark "Wite-Out" was registered by the United States Patent and Trademark Office on February 5, 1974. [1] The application listed the date of "first use in commerce" as January 27, 1966. Early forms of Wite-Out sold through 1981 were water-based and hence water- soluble. While this allowed simple cleaning, it also had the problem of long ...

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