Perhaps one of the most unusual types of souvenir available to tourists were items made of brimstone (sulphur) at the Anglesey copper works on Parys Mountain where sulphur was not only a byproduct but a major cause of pollution for several decades.
this flour of Brimstone is then cast into various moulds, or rolls to be disposed of; cups and saucers, also chocolate cups, some of each I bought but they are so brittle they broke in the carriage:
Sykes, Christopher, Sir (1749-1801, of Sledmere, Yorkshire, M.P. for Beverly, 1784-1790), Journal of a Tour in Wales, 1796, NLW MS 2258C (Typescript copy) p. 59; Sykes, Lady, Hull University, DDSY(3)/10/11 which is very similar to her husand’s, pp. 238] for a full transcription of the Sykes’ description of the site, see Anglesey copper works
[At the inn at Amlwch] A very nice girl waited on us and she gave us some cups and saucers made of sulphur which were so brittle that we broke most of them.
A Journal of a tour through North Wales, by members of the Hawarden Castle family and written by ‘M. Williams’ (a woman), ‘copied from my notes and finished 3.11.1824’. Illustrated with numerous colour- washed pencil sketches. Aug. 16-21 1824; NLW Glynne of Hawarden 56 [no page numbers].