look up any word, like wyd:

1 definition by léatheist

 
1.
OTC
meaning off-the-corner meant by chemists as in easily accesible chemicals, like table salt, instead of chemicals nearly impossible to get, mostly used when talking about production of reactive acids for used in chemistry such as explosives, in production of sulfuric and nitric acid fx.
low concentration H2O2 is pretty OTC and can be concentrated easily
by léatheist November 03, 2012