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In a previous study using the Rorschach method, it was shown that a group of 9-year-old children did not increase their mean number of responses to the VIII, IX and X chromatic cards, in comparison to an achromatic version of those same cards, as was the case with a group of young adults. In the current study, two new groups of children of both sexes were tested, one group aged 5 and 6, the other, aged 11 and 12. The authors’ aim was to determine how these children, situated at two crucial stages of development, would react to the administration of the standard version and to an achromatic version of the Rorschach cards in terms of their number of responses. Another purpose was to find some indicator of the age at which the change to a significantly larger R took place, as a result of the chromatic aspect of the cards. Results obtained show that no significant difference was found between the number of responses given by each group to any of the chromatic or achromatic forms of these cards. However, when considering the Afr variable mean values obtained in this study and particularly in the Portuguese normative data, we were able to disclose a descending line from age 6 to 10 indicating a colour-inhibiting effect on the production of responses. The authors presume that the period where colour begins its incremental effect on the production of responses starts at 11 or 12 years of age. They also suggest that colour perception has a different function and significance before and after 11 years of age.