TY - JOUR A1 - Guilherme, A. A1 - Hodoroaba, Vasile-Dan A1 - Benemann, Sigrid A1 - Coroado, J. A1 - Carvalho, M.L. T1 - Morphological and compositional features of blue and yellow pigments used in Portuguese glazed ceramics by SEM/EDX - unravelling manufacturing differences N2 - Morphological and compositional features regarding blue and yellow pigments used in glazed ceramics from Portugal are investigated by means of a SEM/EDX system. Fragments of samples produced in the main pottery-making centres between the XVI–XVIII centuries (Lisbon and Coimbra) were the objects of study. The main question to be answered is whether there are differences in the manufacturing procedures employed. For this purpose, two types of samples were analysed: faiences and wall-tiles (the famous 'Azulejos', in Portuguese). Differences between the manufacturing techniques of the two production centres were veritably found. The expected linkage between Fe–Co–Ni–As–Bi was challenging to investigate. Thus, Co was found in Fe- or Ni-rich structures, but with no structural connection to As or Bi. However, the As-needle-like structures were always identified in blue regions. One interesting finding related particularly to the blue pigment was the presence of SnO2 agglomerates throughout the whole glaze, which suggests its intentional addition for 'lightening' the well known dark Co blue. Concerning the yellow pigment differences established in the crystal shape and size are indicative of different firing temperatures used. KW - Scanning electron microscope (SEM) KW - Energy dispersive X-ray spectroscopy (EDX) KW - Portuguese glazed ceramics KW - Coimbra KW - Lisbon KW - Blue pigment KW - Yellow pigment KW - Morphology KW - Elemental composition KW - Firing temperature PY - 2014 DO - https://doi.org/10.1039/c3ja50268f SN - 0267-9477 SN - 1364-5544 VL - 29 IS - 1 SP - 51 EP - 57 PB - Royal Society of Chemistry CY - London AN - OPUS4-29722 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -