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2. Gram stain - Wikipedia

   en.wikipedia.org/wiki/Gram_stain

   A Gram stain of mixed Staphylococcus aureus (S. aureus ATCC 25923, gram-positive cocci, in purple) and Escherichia coli (E. coli ATCC 11775, gram-negative bacilli, in red), the most common Gram stain reference bacteria. Gram stain (Gram staining or Gram's method), is a method of staining used to classify bacterial species into two large groups ...

3. How to Remove Almost Every Type of Stain - AOL

   www.aol.com/lifestyle/remove-almost-every-type...

   The basic stain removal guidelines—act quickly, blot, use cold water—apply for carpet but the most effective method will depend on the material and the stain itself. “As soon as the spill ...

4. Crystal violet - Wikipedia

   en.wikipedia.org/wiki/Crystal_violet

   Crystal violet or gentian violet, also known as methyl violet 10B or hexamethyl pararosaniline chloride, is a triarylmethane dye used as a histological stain and in Gram's method of classifying bacteria.

5. Gram-positive bacteria - Wikipedia

   en.wikipedia.org/wiki/Gram-positive_bacteria

   Gram-positive bacteria have a thick layer of peptidoglycan within the cell wall, and Gram-negative bacteria have a thin layer of peptidoglycan. Gram-positive bacteria take up the crystal violet stain used in the test, and then appear to be purple-coloured when seen through an optical microscope.

6. Talk:Gram-negative bacteria - Wikipedia

   en.wikipedia.org/wiki/Talk:Gram-negative_bacteria

   Gram-positive bacteria appear dark blue or violet due to the crystal violet stain following the Gram stain procedure; Gram-negative bacteria, which cannot retain the crystal violet stain, appear red or pink due to the counterstain (usually safranin).

7. Stain removal - Wikipedia

   en.wikipedia.org/wiki/Stain_removal

   Another factor in stain removal is the fact that stains can sometimes comprise two separate staining agents, which require separate forms of removal. A machine oil stain could also contain traces of metal, for example. [1] Also of concern is the color of the material that is stained. Some stain removal agents will not only dissolve the stain ...