Marking blue: Difference between revisions

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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.

Composition

Marking blue is made by mixing methylated spirits with shellac and gentian violet.^[1]

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 castings or forgings, 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]

References

^ ^a ^b Brink, C.; McNamara, B. (2008), Engineering Fabrication & Boilermaking, Pearson South Africa, p. 44, ISBN 978-1-77025-374-2.

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[brink-1] Brink, C.; McNamara, B. (2008), Engineering Fabrication & Boilermaking, Pearson South Africa, p. 44, ISBN 978-1-77025-374-2.

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+{{short description|Layout stain used in metalworking}}
-'''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.
+{{distinguish|engineer's blue}}
+{{More citations needed|date=February 2024}}
+[[file:Engineers Blue Naomi SexyCyborg Wu 2019.png|thumb|Marking out a metal bar]]
+'''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.
-Marking blue is made by mixing [[methylated spirit]]s with [[shellac]] and [[gentian violet]].<ref name="brink">{{Citation | last = Brink | first = C. | last2 = McNamara | first2 = B. | title = Engineering Fabrication & Boilermaking | page = 44 | publisher = Pearson South Africa | year = 2008 | url = http://books.google.com/books?id=coOZXYLqqPoC&lpg=PA44 | isbn = 978-1-77025-374-2}}.</ref> <!-- Prussian blue with [[ethanol|alcohol]] to form a quick drying stain.  <-Is this true? --> This is not to be confused with [[engineer's blue]], made by mixing Prussian Blue with oil. However this is sometimes incorrectly called engineers blue.
-==Alternatives==
+== Composition ==
-A [[felt tip marker]] can be used as they are convenient and tend not to dry up as quickly; marking blue in the form of dye or ink has a tendency to dry in the containers and become unusable quickly.{{Citation needed|date=October 2009}} On rough structures, such as [[casting]]s or [[forging]]s, [[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.<ref name="brink"/> This thin copper coating is more resistant to rough handling and the action of [[cutting fluid]].{{Citation needed|date=October 2009}}
+Marking blue is made by mixing [[methylated spirit]]s with [[shellac]] and [[gentian violet]].<ref name="brink">{{Citation | last = Brink | first = C. | last2 = McNamara | first2 = B. | title = Engineering Fabrication & Boilermaking | page = 44 | publisher = Pearson South Africa | year = 2008 | url = https://books.google.com/books?id=coOZXYLqqPoC&lpg=PA44 | isbn = 978-1-77025-374-2}}.</ref> <!-- Prussian blue with [[ethanol|alcohol]] to form a quick drying stain.  <-Is this true? -->
-==References==
-{{Reflist}}
+== Alternatives ==
-{{Metalworking navbox|toolopen}}
+A [[felt tip marker]] can be used as they are convenient and tend not to dry up as quickly. On rough structures, such as [[casting]]s or [[forging]]s, [[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.<ref name="brink"/>
-[[Category:Dyes]]
-[[Category:Inorganic pigments]]
-[[Category:Metalworking measuring instruments]]
+== References ==
+{{refs}}
 {{metalworking-stub}}
 {{tool-stub}}
+{{Metalworking navbox|toolopen}}
+[[Category:Dyes]]
+[[Category:Metalworking measuring instruments]]