Quoting albyn austin <[log in to unmask]>:
> Laundry blue to whiten clothes was produced from clay minerals near
> Backbarrow in south Cumbria until the 1970s, the "Dolly Blue Works".
>
Dolly Blue is sodium poylsulphide. Chemically it is the same as ultramarine,
the pigment obtained from Lapis Lazuli. Nothing to do with cobalt.
Malcolm Henry
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