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Marking blue

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Title: Marking blue  
Author: World Heritage Encyclopedia
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Subject: Engineer's blue, Marking out, Blue Steel, Metalworking measuring instruments, Inorganic pigments
Collection: Dyes, Inorganic Pigments, Metalworking Measuring Instruments
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Marking blue

Marking blue, layout stain or Prussian blue is a dye used in metalworking to aid in marking out rough parts for further machining. It is sometimes called Dykem (after a popular brand). It is used to stain or paint a metal object with a very thin layer of dye that can be scratched off using a scriber or other sharp instrument to reveal a bright, yet very narrow line in the metal underneath. The advantages are that any existing scratches are covered with the dye and the new lines have a contrasting background.

Marking blue is made by mixing methylated spirits with shellac and gentian violet.[1] This is not to be confused with engineer's blue, made by mixing Prussian Blue with oil.

Alternatives

A whitewash or a mixture of chalk and water can be used. A solution of copper sulfate, distilled water, and a few drops of sulfuric acid can be used on machined surfaces.[1] This thin copper coating is more resistant to rough handling and the action of cutting fluid.

References

  1. ^ a b Brink, C.; McNamara, B. (2008), Engineering Fabrication & Boilermaking, Pearson South Africa, p. 44,  .


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