The problem with these names is that, subconsciously, they conjure up the very things you're trying to avoid. The term "slaughterless" calls to mind visions of slaughter. The word "painless," especially in an unfamiliar context -- like that of food -- gives a queezy feeling in the pit of the stomach. (One thinks: "Is this food going to hurt me?") And the word "humane" is close enough to "human" to cause discomfort, even in people who are well aware of the difference between those words.
Far better, IMO, to go with phrasing that draws no attention to negatives. "Sustainably raised," "sustainably grown," or even just "sustainable" would be interesting choices. (Though even the word "grown" might evoke the wrong idea for a lot of consumers). This phrasing says "green" without implying "Soylent Green." Alternatively, you borrow a page from the tuna industry, who wisely chose "dolphin-safe" over the more psychologically onerous "dolphin-free," and go with "animal-safe" or some variant thereof.
Of your suggestions, "guiltless" also seems pretty effective. I'm on the fence about "pure," inasmuch as it forces the mind to wander to the meat's origins. Furthermore, it could backfire in a big way -- especially with the Christian crowd, who would see cultured meat as "unnatural" in comparison to traditional meat.
The problem with these names is that, subconsciously, they conjure up the very things you're trying to avoid. The term "slaughterless" calls to mind visions of slaughter. The word "painless," especially in an unfamiliar context -- like that of food -- gives a queezy feeling in the pit of the stomach. (One thinks: "Is this food going to hurt me?") And the word "humane" is close enough to "human" to cause discomfort, even in people who are well aware of the difference between those words.
Far better, IMO, to go with phrasing that draws no attention to negatives. "Sustainably raised," "sustainably grown," or even just "sustainable" would be interesting choices. (Though even the word "grown" might evoke the wrong idea for a lot of consumers). This phrasing says "green" without implying "Soylent Green." Alternatively, you borrow a page from the tuna industry, who wisely chose "dolphin-safe" over the more psychologically onerous "dolphin-free," and go with "animal-safe" or some variant thereof.
Of your suggestions, "guiltless" also seems pretty effective. I'm on the fence about "pure," inasmuch as it forces the mind to wander to the meat's origins. Furthermore, it could backfire in a big way -- especially with the Christian crowd, who would see cultured meat as "unnatural" in comparison to traditional meat.