“…One raw material by Wengers, Lda was identified as a glaze -Aventurin Glaze 1092 G. Eleven samples were produced by Wengers, Ltd. (Table 1), a manufactory of ceramic colours, chemicals, glazes, minerals and raw materials for the ceramic industry, including pottery, tile, brick, glass and vitreous-enamelling on metal industries, located at Etruria (Stoke-on-Trent, England). This company was originally founded in Staffordshire in 1870 and ceased trading in 1984 [5]. Four of the studied ceramic colourants were produced by Blythe Colour Works (Table 1), a company located at Cresswell and specialist in colours, enamels and glazes production for the pottery industry.…”