So what exactly do we mean by 'blood mutation'? Are we talking that trolls like Aleida and Zarka would be social outcasts as Karkat or other candy-reds were? If this is the case I amy change Zarkal's blood color. I wanted him to be a realtively high sea dweller and being 'outcast' to that extent really isn't something I see being a part of his character, so if that conflicts with our view of what the 'mutant' variation among the high bloods mean, please let me know so I can change him to a more suitable color for what I'm going for with him.:D