Matuszczyk, M.M., Oborska-Oracz, A. and Wowak, J. 2021. The Gray and Black Ceramics – the Causes of a Specific Color Formation in the Lightof the Current Research and the Firing Process Analysis. Acta Universitatis Nicolai Copernici [Heritage Studies and Conservation Science]. 50, (Apr. 2021), 165–190. DOI:https://doi.org/10.12775/AUNC_ZiK.2019.006.