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2. Stain - Wikipedia

   en.wikipedia.org/wiki/Stain

   A stain is a discoloration that can be clearly distinguished from the surface, material, or medium it is found upon. They are caused by the chemical or physical interaction of two dissimilar materials. Accidental staining may make materials appear used, degraded or permanently unclean. Intentional staining is used in biochemical research and ...

3. Wood finishing - Wikipedia

   en.wikipedia.org/wiki/Wood_finishing

   Wood finishing. A worker sprays a urethane finish onto a timber. Wood finishing refers to the process of refining or protecting a wooden surface, especially in the production of furniture where typically it represents between 5 and 30% of manufacturing costs. [1] [2]

4. Sudan stain - Wikipedia

   en.wikipedia.org/wiki/Sudan_stain

   Sudan stains and Sudan dyes are synthetic organic compounds that are used as dyes for various plastics (plastic colorants) and are also used to stain sudanophilic biological samples, usually lipids. Sudan II , Sudan III , Sudan IV , Oil Red O , and Sudan Black B are important members of this class of compounds (see images below).

5. Prussian blue - Wikipedia

   en.wikipedia.org/wiki/Prussian_blue

   Prussian blue is a common histopathology stain used by pathologists to detect the presence of iron in biopsy specimens, such as in bone marrow samples. The original stain formula, known historically (1867) as " Perls Prussian blue " after its inventor, German pathologist Max Perls (1843–1881), used separate solutions of potassium ferrocyanide ...

6. 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.

7. Oil paint - Wikipedia

   en.wikipedia.org/wiki/Oil_paint

   Oil paint is a type of slow-drying paint that consists of particles of pigment suspended in a drying oil, commonly linseed oil. The viscosity of the paint may be modified by the addition of a solvent such as turpentine or white spirit , and varnish may be added to increase the glossiness of the dried oil paint film.