chromophobia
From Longman Dictionary of Contemporary Englishchromophobiachro‧mo‧pho‧bi‧a /ˌkrəʊməˈfəʊbiə $ ˌkroʊməˈfoʊ-/ noun [uncountable] technical a strong fear of colours, often combined with the unreasonable belief that something will be bad if it is a particular colour —chromophobic adjective