Some errata in the text of the paper "Thermal and Raman-spectroscopic analysis of Maya blue carrying artifacts, especially fragment IV of the Codex Huamantla" [Thermochim. Acta 456 (2007) 56-63] were noticed, and some historical inaccuracies were revealed. A discussion on the methodological approach using Raman spectroscopy to identify Maya blue in the codex is presented here, not questioning, however, the authenticity of the codex. (C) 2007 Elsevier B.V. All rights reserved.