PURPOSE: A first agent for an oxidative hair dye is provided to enhance viscosity with excellent stability by mixing predetermined ester and alkaline chemicals.CONSTITUTION: A first agent for an oxidative hair dye is a cream formulation which is prepared by mixing an oxidative dye, ester of formula I (R^1-COO-R^2) of higher fatty acids and high carbon number alcohols, and alkaline chemicals. The pH concentration of the first agent is 8.0-12.0. The first agent is mixed with oleic acid oleyl. The oxidative hair dye contains the first agent and a second agent for the oxidative hair dye, which is mixed with an oxidant. The mixing amount of ester is 0.5 mass% - 3.0 mass%.COPYRIGHT KIPO 2013[과제] 점도가 높여진 산화 염모제용 제1 제의 제공.[해결 수단] 산화 염료, 하기 식 (I)로 나타내는 고급 지방산과 고급 알코올의 에스테르, 및 알칼리제가 배합된 크림상의 산화 염모제용 제1 제.R1-COO-R2 (I)[상기 식 (I)에 있어서, R1은 불포화도가 1인 탄소수 12 이상 22 이하의 직쇄형 알켄을 나타내고, R2는 불포화도가 1인 탄소수 12 이상 22 이하의 직쇄형 알켄을 나타낸다.]
