4C Labs pack colours

Noticed with Integro/IPS a flood of new strains just showed up from 4C. The one I tried so far is incredible (from the earlier lot last year) anyone know or care to guess the significance of grouping different strains together by pack colour?

I wonder if they have colour coded strain guide material kicking about that falls foul of "advertising" regs in uk so our clinics can't make it available to us.