Judgements of colour harmony were made by observers, including some with normal colour vision and some with a colour vision deficiency. A set of colour pairs applied to food colourings was rated on a 1-10 scale of harmony, in two different locations, Norway and Taiwan. The results indicate that the harmoniousness of the colour pairs was rated slightly lower by the colour-deficient observers, but that other factors - the type of food object and the different nationalities of the observers - had a greater effect. It was also found that the results of showing deuteranope simulations of the colour pairs to normal observers did not agree with judgements made by those observers with an actual colour vision deficiency.