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2. Oil - Wikipedia

   en.wikipedia.org/wiki/Oil

   An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) and lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated lipids that are liquid at room temperature. The general definition of oil includes classes of chemical ...

3. Petroleum - Wikipedia

   en.wikipedia.org/wiki/Petroleum

   Petroleum, also known as crude oil or simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, [1] and is found in geological formations. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that consist of refined crude oil. Petroleum is primarily recovered by oil ...

4. Glaze (painting technique) - Wikipedia

   en.wikipedia.org/wiki/Glaze_(painting_technique)

   A glaze is a thin transparent or semi-transparent layer on a painting which modifies the appearance of the underlying paint layer. Glazes can change the chroma, value, hue and texture of a surface. Glazes consist of a great amount of binding medium in relation to a very small amount of pigment. [1] Drying time will depend on the amount and type ...

5. Cleaning agent - Wikipedia

   en.wikipedia.org/wiki/Cleaning_agent

   Cleaning agent. Cleaning agents or hard-surface cleaners are substances (usually liquids, powders, sprays, or granules) used to remove dirt, including dust, stains, foul odors, and clutter on surfaces. [1] Purposes of cleaning agents include health, beauty, removing offensive odor, and avoiding the spread of dirt and contaminants to oneself and ...

6. Haematoxylin - Wikipedia

   en.wikipedia.org/wiki/Haematoxylin

   Haematoxylin stain formulations can be broadly classified based on how the haematoxylin is oxidized (or ripened) and by choice of the mordant used. Haematoxylin stain formulations may either be natural oxidized by exposure to air and sunlight, or more commonly, especially in commercially prepared solutions, [7] chemically oxidized using sodium ...

7. Gram stain - Wikipedia

   en.wikipedia.org/wiki/Gram_stain

   Gram stain of Candida albicans from a vaginal swab. The small oval chlamydospores are 2–4 µm in diameter. Gram staining is a bacteriological laboratory technique used to differentiate bacterial species into two large groups (gram-positive and gram-negative) based on the physical properties of their cell walls.