Jon,
I have seen something similar at a former timber treatment works. We thought it was copper sulphate which is part of copper-chrome-arsenic treatment preparations. Extraordinarily vivid blue!
Kind regards,
Cila Gardner
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Mrs Ercilia Gardner BSc Hons FGS CGeol
Principal Geo-Environmental Engineer
RED ROCK GEOSCIENCE
(formerly Yeandle Geotechnical Ltd)
East Wing
Station House
Broadclyst
Exeter, Devon
EX5 3AS
Email [log in to unmask]
TEL: 01392 460 800
FAX: 01392 460 888
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