Guest posting from Hugh Farey (yipee – another science bod!): here’s a snapshot of his current studies of scorching and uv fluorescence.

HF3a versus HF 3b query

Molten Lead. A blob of molten lead poured onto eight layers of linen and allowed to cool. The UV ‘fringe’ very obvious where the scorch is dark, intruding into the middle as the scorch becomes less visible.

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