8618 M 15

Found by Ian Suddaby at the Manuel Works, Whitecross.

This example is not in my possession.

The red stencil on the stretcher is not clear but appears to read 8618 M however if it is being read the other way it may read W 8198

The manufacturer is unknown but due to the find location, it was very likely manufactured on site.

  • Stein, Castlecary Fireclay Works, Castlecary, Stirlingshire.
  • Stein, Manuel Firebrick and Refractory Works, Whitecross, Stirlingshire.
  • Stein & Co, Anchor Brickworks, Denny, Stirlingshire.
  • Milnquarter Fireclay & Gannister Works, Bonnybridge, Stirlingshire

Below – Ian states – Manuel Brickworks and still looking for information to identify a series of Mullite-like bricks with a purple patina on some or all of the faces. These are not Chro-Mag bricks with the purple fabric, the grey-white granular fabric is just like Mullite but none of my Mullite-named bricks have this purple colour. Is it Fused Mullite perhaps?

William Kennon Pirt states – Could be alumina chromes. If I recall, these were made with a 5%, or 3% green chromic oxide addition to the matrix to create a chrome-alumina spinel bond when fired. On firing, the green chromic oxide changes colour to light purple(ish), the same colour as chrome marking paint goes on fired lab samples. if the staining is only a surface feature it could also be that the alumina/mullite bricks have been fired in close proximity to unfired, chrome-containing bricks giving off hexavalent chrome during their firing process.



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