@article{beltran_2008,  title={Humphry Davy e as cores dos antigos},  volume={31},  ISSN={0100-4042},  url={https://doi.org/10.1590/S0100-40422008000100033},  DOI={10.1590/S0100-40422008000100033},  number={1},  journal={Química Nova},  publisher={Sociedade Brasileira de Química},  author={Beltran, Maria Helena Roxo},  year={2008},  pages={181–186} }