This permanent algae-based gel compound from JF Lazartigue covers 100% of grey hair while leaving a healthy, glossy color. Algae gel coats the hair shaft to protect and add shine. Color emulsion has no lightening strength as it does not contain peroxide or ammonia. To use: First time coverage: first apply the product on roots, then to the rest of the hair. Leave on for 20-40 minutes and rinse well until water runs clear. Follow with applying two packs of neutralizing bath. Massage in and leave on for 10 minutes. Rinse thoroughly. For touch up of your roots: apply one tube to the roots only. Leave on for 20-40 minutes and rinse well. Apply one pack of neutralizing bath. Massage in, leave on for 10 minutes and rinse. 2 fl. oz. Measurements: ; Capacity: 2 oz