Olive Young best sellerProgressive gray-toning herbal shampoo
Ryo Double Effector Black Shampoo
Amorepacific
Our read
Why our pick wins
A basic-dye toning shampoo built on Amorepacific's herbal Black Toning complex (black ginseng, black bean, arrowroot) with nitrophenol and basic dyes — no PPD or peroxide, but coverage builds over roughly 21 washes and gradually rinses out. Ours is a one-wash, fuller grey cover.
Screening score
How they compare
Ryo Double Effector Black Shampoo
8.1 / 10
GDS Hair Dye Shampoo — Grey Coverage in 3 Minutes 250ml / 190mlDHALIORA pick
8.6 / 10
See the DHALIORA pick
GDS Hair Dye Shampoo — Grey Coverage in 3 Minutes 250ml / 190mlScreening score 8.6 / 10
What's inside
Ingredient breakdown
12 ingredients screened
Co-Surfactant
Low
Conditioning
Low
Anti-Hairloss Functional
Mid
Scalp Care
Low
Semi-permanent basic dye
Mid
Semi-permanent basic dye
Mid
Semi-permanent basic dye
Mid
Nitro hair dye (restricted-use)
Mid
Nitro hair dye (restricted-use)
Mid
Preservative
Low
pH Adjuster
Low
Fragrance
Mid
About this comparison — This is an editorial, factual comparison. Ingredient risk reflects our own reading of publicly available safety data, an EWG-style reading. DHALIORA is not affiliated with, endorsed by, or partnered with the competitor brand. Nothing here is medical advice — always read the packaging and patch-test where indicated.