Three containers of opacity tubes standardisation of bacterial vaccines by Burroughs Wellcome & Co., c.1920. Each contains glass tube with solution, one dated in pencil as 1943
Opacity tubes were used to standardise anti-bacterial vaccines from 1915 onwards. The opaque appearance of a vaccine of unknown concentration is compared to a standard tube of known concentration. A light is shone through the unknown tube and is compared to each of the ten standard glass tubes in the kit to determine which one it matches most closely. Provided with the kit is a list of how much bacteria per millimetre is in each tube for certain types of bacteria.
- Public Health & Hygiene
- Object Number:
- opacity tube
- Unknown source
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