Letter – Thomas Thomson to John Mulcaster – 18 Oct 1827

Document Type: Letter
Date: 18 Oct 1827
Correspondent: Thomas Thomson
Recipient: John Mulcaster
Archive Source: NRO 672 E 1E 6
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Mr John Mulcaster Blaydon House

Near Newcastle upon Tyne 

							Glasgow 18th Octr 1827

Dear Sir

I have just finished the examination of your White Lead & I have been a good deal surprised at the result, It contains 4 foreign substances; Viz. Silica, Alumina, Iron & Manganese. The first three are present in very minute quantity. But the manganese in the state of Carbonate is so abundant that I succeeded in separating it & weighing it. To its presence I ascribe the bad colour of your White Lead. I cannot devine how the manganese found its way into the Lead, as I am not aware of any Ores of Manganese in your mines – I see no method of improving your White Lead except getting a purer Lead to operate on

      I am etc  Thomas Thomson

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The Dukesfield Smelters and Carriers Project aimed to celebrate and discover the heritage of the Dukesfield Arches & lead carriers' routes between Blaydon and the lead mines of Allendale and Weardale. A two year community project, it was led by the Friends of the North Pennines in partnership with Hexhamshire and Slaley Parish Councils and the active support of Allendale Estates. It was funded by the Heritage Lottery Fund and the generous support of other sponsors. Friends of the North Pennines: Charity No:1137467