Hair Chalk: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
They disagree: Claude chooses Kevin Murphy and GPT chooses Splat
In Beauty & Personal Care, Claude and GPT choose the same brand in 31 of 57 categories.
Claude Opus 5.5 · October 27, 2026
Kevin Murphy Color.Bug (line)
Color.Bug is a temporary color chalk from a professional styling brand that shows up on both light and dark hair and washes out with shampoo.
Not for: Anyone wanting color that lasts past the next wash, and very porous bleached blondes, who may see slight staining.
GPT 6.1 Sol · November 11, 2026
Splat Hair Chalk Midnight Blue
Temporary blue color without bleach, with a compact applicator for controlled streaks and highlights.
Not for: Permanent color, all-over coverage, or anyone unwilling to risk transfer onto clothing.
Check before you buy
Where to find Kevin Murphy Color.Bug
- Overstock Beauty
- Sleekshop
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Kevin Murphy: Color.Bug is a well-known temporary chalk.
What to avoid
- Unlabeled children's chalk sets with no ingredient list.
- Wetting hair before application if you're blonde, since it drives pigment deeper.