Olive Young best sellerProgressive gray-toning herbal shampoo

Ryo Double Effector Black Shampoo

Ryo Double Effector Black Shampoo
Our read

Why our pick wins

A basic-dye toning shampoo on Amorepacific's herbal Black Toning complex, with nitrophenol dyes and no oxidative system — so no PPD, no couplers, no peroxide. It also takes roughly 21 washes to build and rinses back out again. Ours is permanent: fewer washes to get there, and it does not wash away.

Screening score

How they compare

Ryo Double Effector Black Shampoo 8.1 / 10
Levero Coloring Shampoo — PPD-Free Grey Coverage 300mlDHALIORA pick 8.5 / 10
Levero Coloring Shampoo — PPD-Free Grey Coverage 300ml See the DHALIORA pick Levero Coloring Shampoo — PPD-Free Grey Coverage 300mlScreening score 8.5 / 10
What's inside

Ingredient breakdown

12 ingredients screened

Low
Caffeine
Conditioning
Low
Menthol (L-Menthol)
Anti-Hairloss Functional
Mid
Low
Basic Blue 99
Semi-permanent basic dye
Mid
Basic Yellow 87
Semi-permanent basic dye
Mid
Basic Orange 31
Semi-permanent basic dye
Mid
2-Amino-6-Chloro-4-Nitrophenol
Nitro hair dye (restricted-use)
Mid
4-Hydroxypropylamino-3-Nitrophenol
Nitro hair dye (restricted-use)
Mid
Sodium Benzoate
Preservative
Low
Citric Acid
pH Adjuster
Low
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.