Is there any way to increase blood quality of the current type?

[spacewalker]

Is there any way to increase blood quality of the current type?

[Karax]

The only way is to hunt npcs with better blood quality

[Suzaku]

Nope.

[Lil' Sparkles Jr.]

Mutant gruel? Increases purity but has a chance to turn prisoner into monster.

[torqueblue]

There's a potion that increases your current blood type by 5%, doesn't stack up as far as I know.

Another way is to gamble on gruel on prisoners.