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Bacta was a synthetic chemical that consisted of gelatinous, translucent red alazhi and kavam bacterial particles mixed within a colorless, viscous liquid called ambori.
Bacta could be administered through disposable bacta patches, injection, or by submersion in a bacta tank.
Bacta had a smell that was described as 'sickly-sweet'; immersion in a bacta tank could leave one with the taste and smell of bacta for weeks afterwards, and even bacta patches left such residue (although presumably less strong and shorter lasting).