An industrious mine spirit, who worked as hard as any brownie, but, unlike a brownie, expected to be paid a working man's wages. An account of him appeared in the Colliery Guardian in May 1863:

The supernatural person in question was no other than a ghostly putter, and his name was Blue-cap. Sometimes the miners would perceive a light-blue flame flicker through the air and settle on a full coal-tub, which immediately moved towards the roily-way as though impelled by the sturdiest sinews in the working. Industrious Blue-cap required, and rightly, to be paid for his services, which he moderately rated as those of an ordinary average putter, therefore once a fortnight Blue-cap's wages were left for him in a solitary corner of the mine. If they were a farthing below his due, the indignant Blue-cap would not pocket a stiver; if they were a farthing above his due, indignant Bluecap left the surplus revenue where he found it.

At the time when this was written, the belief in Blue-cap — or Bluebonnet, as he was called in some of the mines — was already on the wane.

[Motifs: F456; F456.1; F456.2; F456.2.1]