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The process in which trolls turn into a rainbow drinker is mostly unknown. Kanaya becomes a rainbow drinker after Eridan kills her. One possibility is that Karkat's attempt to kiss her back to life awoke her Drinker status due to his status as a Hero of Blood. It is hinted at that a troll is born a Rainbow Drinker and does not become one when Aranea talks about Porrim's backstory in Openbound:
On 8eforus, well 8efore her drinker a8ilities had awoken...
Rainbow Drinkers have white skin that normally glows, however, as seen with Porrim and later Kanaya, more experienced Rainbow Drinkers can turn off this glow. Their scleras appear bright yellow instead of the usual orange. Currently, the reason for this is unknown. However, Rainbow Drinkers can "turn off" this glow.