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Y. Katsumura, S. Shio, T. Kobayashi and S. Fukushima, “Cross-Sensitivity of Oxidized Products of p-Phenylenediamine in Guinea Pigs,” HiFu, Vol. 32, No. 8, 1990, pp. 54-59.

has been cited by the following article:

• TITLE: Hair Dyeing by Using Catechinone Obtained from (+)-Catechin

  AUTHORS: Yasunaga Hidekazu, Takahashi Akiko, Ito Kazue, Ueda Masahisa, Urakawa Hiroshi

  KEYWORDS: Hair Dyeing; Catechinone; Dyestuff; (+)-Catechin; Biobased Materials; Safer; Human-Friendly

  JOURNAL NAME: Journal of Cosmetics, Dermatological Sciences and Applications, Vol.2 No.3, September 17, 2012

  ABSTRACT: A novel colourant for hair dyeing was prepared by an enzymatic reaction with (+)-catechin and its characteristics as a hair dyestuff were studied. The study is aimed at inventing the hair dyestuff that is human- and eco-friendly. One potentially powerful dyestuff was obtained from (+)-catechin treated with tyrosinase after screening experiments using biobased materials. The obtained reddish orange colourant, 4-(3,4-dihydro-3α,5,7-trihydroxy-2H-1-benzopyran-2α-yl) 1,2-benzoquinone named “catechinone”, shows enough dyeability for decolourised white hair. Catechinone does not cause erythema or oedema on skin of rabbits. The colour is controlled by the addition of other biobased materials and a variety of colours of dyed hair are acquired. The fastness to light or washing for hair dyed by catechinone is high enough for practical use.