Marking blue

 ( Dyes ) 

Marking blue or layout stain (sometimes called Dykem after trademark erosion of a popular brand, or Prussian blue after the blue pigment) is a dye used in metalworking to aid in marking out rough parts for further machining. 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.

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Composition Marking blue is made by mixing methylated spirits with shellac and gentian violet..

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Alternatives A felt tip marker can be used as they are convenient and tend not to dry up as quickly. On rough structures, such as or , 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.

Categories: Dyes, Metalworking Measuring Instruments

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