Iron oxide red

Iron (III) oxide, pure powder

Iron oxide red, yellowish CI Pigment Red 101

Iron oxide red bluish
C.I. Pigment red 101

Iron oxide red is a collective name for red pigments that consist of iron (III) oxide (Fe ₂ O ₃ ). They belong to the iron oxide pigments .

Iron oxide red is listed in the Color Index under CI Pigment Red 101. Iron oxide red has good coverage, is inexpensive, highly weather-proof and has a typical cloudy color. Depending on the particle size, iron oxide red pigments can be set to have a yellowish cast (small particle size) to a bluish cast (coarse particles).

The numerous shades of iron oxide red include:

• Eisenmennige ( Mars red , Parisian red )
• English red
• Pompeian red
• Venetian red
• Indian red
• Caput mortuum

General

While the red earths are naturally obtained pigments, which usually consist of 5 to 20% clay and silicate minerals , iron oxide red denotes partly much purer iron oxide , partly bound to a substrate .

Falun red , Faluröd or Schwedenrot is a common iron oxide red color in Sweden that is traditionally used on wooden facades.

production method

The preparation of iron oxide is made by roasting (desulfurizing) natural ores , firing of iron oxide yellow or precipitated (synthetic production).

The synthetic production takes place according to the Laux process, named after the chemist Julius Laux , or by the Penniman process, named after the American inventor. The iron oxide red is obtained by subsequent annealing of the iron oxide pigments at 700 to 800 ° C.

literature

• Kurt Wehlte : Materials and techniques of painting. Otto Maier, Ravensburg 1967 (also: English and others, Wiesbaden 2009, ISBN 978-3-86230-003-7 ).

Individual evidence

1. ↑ G. Buxbaum, G. Pfaff: Industrial Inorganic Pigments. 3rd edition, Wiley-VCH, Weinheim 2005, ISBN 3-527-30363-4 .
2. ^ The Society of Dyers and Chemists; Color index; Third edition; Second revision; Charlesworth & Co .; Huddersfield; 1982
3. ↑ Inorganic Pigments. In: lanxess.de. Retrieved July 6, 2017 . 
4. ^ Penniman method. In: wasser-wissen.de. Retrieved July 6, 2017 . 
5. ↑ Page no longer available , search in web archives: Production at www.fh-muenster.de