Why do this?
* More visible branding. There is a mechanic for branding right now, but it's pretty opaque.
* RP surrounding branding and investigation; when, for instance, a corporate character has Mix cook-branded candy or vice versa.
* More utility for the ability of chefs to 'tailor' the candy the chems they produce. Without going too deep into IC information, chemists can produce candy with particularized effects, but the ability to market based on those effects is sharply limited by the inability to distinguish between 'tailor's friend' weed and 'that joint the combat manos like.'
I think this would help chemists compete on things other than just price, and generally increase competitive RP between them, as well as be a tool for investigation (and deception of investigation.)