They are also used as pH indicators and as biological stains.
2.
The "'Biological Stain Commission "'is an organization certifying scientific culture media for bacteria.
3.
Ch . 28 in Horobin RW, Kiernan JA ( eds ) : Conn's Biological Stains, 10th ed.
4.
Penney DP, Powers JM, Willis C, Frank M, Churukian C ( 2002b ) Methods for testing biological stains.
5.
In his book " Biological Stains ", Conn describes gentian violet as a " poorly defined mixture of violet rosanilins ".
6.
Its origins date from 1922, when vendors of biological stains in the USA had exhausted their stocks of pre-war dyes imported from Germany.
7.
In 1922, the Biological Stain Commission appointed a committee chaired by Harold Conn to look into the suitability of the different commercial products.
8.
Penney DP, Powers JM, Frank M, Willis C, Churukian C ( 2002a ) Analysis and testing of biological stains the Biological Stain Commission procedures.
9.
2, 5-Diaminotoluene is also known to be used in the production of dyes for textiles, furs, leathers, biological stains and indicators, wood stains, and pigments.
10.
Penney DP, Powers JM, Frank M, Willis C, Churukian C ( 2002a ) Analysis and testing of biological stains the Biological Stain Commission procedures.
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