Chrome orange is a mixed oxide with the chemical formula Pb2CrO5. It can be made by treating a lead(II) salt with an alkaline solution of a chromate or by treating chrome yellow (PbCrO4) with strongly basic solution. [2]
Pb2CrO5 can be synthesized with a gas-liquid precipitation process. [3] Changing the pH controls whether PbCrO4 or Pb2CrO5 is created. [3]
Orthorhombic nanocrystals can be selectively synthesized in a facile room temperature solution for Pb2CrO5. [4]
Using a microwave-assisted ionic liquid (MAIL) method, bundle and rod-like nanocrystals of Pb2CrO5 were formed. [5] The bundles look like bundles of straw, secured in the middle. [5] In basic solution, single-crystalline Pb2CrO5 could be formed by heating lead acetate and potassium dichromate with microwave radiation for only 10 minutes at 90 celsius. [5] The MAIL process is simple, fast, and does not employ surfactants. [5] The presence of hydroxide changes the phase that is formed. Using NaOH, monoclinic Pb2CrO5 is formed. [5] The bundle and rod-shaped structures are sensitive to electron beam irradiation, which will turn them into many small particles. [5]
The Gibbs free energy of Pb2CrO5 was determined in 2010 and is given as
ΔfG°mPb2CrO5(s)±0.30/(kJ•mol−1)=-1161.3 +0.4059(T/K) (859≤T/K≤1021). [6]
Visible light activity up to 550 nanometers has been recorded for Pb2CrO5. [7]
In an catalog published c. 1835, Winsor and Newton paint company identify ten synthetic pathways for producing chrome orange, also called deep yellow. [8] Chrome orange is made of PbCrO4 mixed with basic lead chromate (Pb2CrO5). [8] It has been described as a “yellowish red or sometimes a beautiful deep red” in alkaline conditions. [8] A deep yellow can be created using PbCrO4 and lead sulfate. [8] There are ten synthetic methods for preparing deep chrome yellow (that made with Pb2CrO5), which require a chromate source, a basic lead source, additives, and a sulfate source. [8] CrO42- + H2SO4+Pb(Ac)2 • 2Pb(OH)2 → PbCrO4+Pb2CrO5 at a pH of approximately seven is the synthesis. [8]
Controlling the pH was Winsor and Newton’s method for creating pigments from the pale yellow to the deep chrome orange. [8] The resulting product has a high stability to light, which is always coveted by artists and collectors. [8]
The natural mineral crocoite was discovered in 1797 by Louis Vauquelin and chrome orange was synthesized as a pigment for the first time in 1809. [9] Pb2CrO5 is found in mineral form as phoenicochroite, which is a monoclinic, red, translucent mineral found in various places across the world, including Russia, the USA, and Chile. [10]
Chrome Orange | |
---|---|
Color coordinates | |
Hex triplet | #E73501 |
sRGBB ( r, g, b) | (231, 53, 1) |
HSV ( h, s, v) | (14°, 100%, 91%) |
CIELChuv ( L, C, h) | (51, 147, 16°) |
Source | ColourLex [11] |
B: Normalized to [0–255] (byte) |
Chrome orange can range in color from light to deep orange and is no longer in production as a pigment. [9] It has also been known as Derby red, Persian red, and Victoria red. [9] It was first recorded as a pigment in 1809 and was perfect for some impressionist painters in the nineteenth century. The yellow-orange pigment of the boat in Renoir’s 1879 painting, The Seine at Asnières (The Skiff) at the National Gallery, London. [9] Chrome orange was used extensively in Frederic Leighton's Flaming June (1895; Museo de Arte de Ponce). [1]
{{
cite encyclopedia}}
: CS1 maint: location (
link).
Chrome orange is a mixed oxide with the chemical formula Pb2CrO5. It can be made by treating a lead(II) salt with an alkaline solution of a chromate or by treating chrome yellow (PbCrO4) with strongly basic solution. [2]
Pb2CrO5 can be synthesized with a gas-liquid precipitation process. [3] Changing the pH controls whether PbCrO4 or Pb2CrO5 is created. [3]
Orthorhombic nanocrystals can be selectively synthesized in a facile room temperature solution for Pb2CrO5. [4]
Using a microwave-assisted ionic liquid (MAIL) method, bundle and rod-like nanocrystals of Pb2CrO5 were formed. [5] The bundles look like bundles of straw, secured in the middle. [5] In basic solution, single-crystalline Pb2CrO5 could be formed by heating lead acetate and potassium dichromate with microwave radiation for only 10 minutes at 90 celsius. [5] The MAIL process is simple, fast, and does not employ surfactants. [5] The presence of hydroxide changes the phase that is formed. Using NaOH, monoclinic Pb2CrO5 is formed. [5] The bundle and rod-shaped structures are sensitive to electron beam irradiation, which will turn them into many small particles. [5]
The Gibbs free energy of Pb2CrO5 was determined in 2010 and is given as
ΔfG°mPb2CrO5(s)±0.30/(kJ•mol−1)=-1161.3 +0.4059(T/K) (859≤T/K≤1021). [6]
Visible light activity up to 550 nanometers has been recorded for Pb2CrO5. [7]
In an catalog published c. 1835, Winsor and Newton paint company identify ten synthetic pathways for producing chrome orange, also called deep yellow. [8] Chrome orange is made of PbCrO4 mixed with basic lead chromate (Pb2CrO5). [8] It has been described as a “yellowish red or sometimes a beautiful deep red” in alkaline conditions. [8] A deep yellow can be created using PbCrO4 and lead sulfate. [8] There are ten synthetic methods for preparing deep chrome yellow (that made with Pb2CrO5), which require a chromate source, a basic lead source, additives, and a sulfate source. [8] CrO42- + H2SO4+Pb(Ac)2 • 2Pb(OH)2 → PbCrO4+Pb2CrO5 at a pH of approximately seven is the synthesis. [8]
Controlling the pH was Winsor and Newton’s method for creating pigments from the pale yellow to the deep chrome orange. [8] The resulting product has a high stability to light, which is always coveted by artists and collectors. [8]
The natural mineral crocoite was discovered in 1797 by Louis Vauquelin and chrome orange was synthesized as a pigment for the first time in 1809. [9] Pb2CrO5 is found in mineral form as phoenicochroite, which is a monoclinic, red, translucent mineral found in various places across the world, including Russia, the USA, and Chile. [10]
Chrome Orange | |
---|---|
Color coordinates | |
Hex triplet | #E73501 |
sRGBB ( r, g, b) | (231, 53, 1) |
HSV ( h, s, v) | (14°, 100%, 91%) |
CIELChuv ( L, C, h) | (51, 147, 16°) |
Source | ColourLex [11] |
B: Normalized to [0–255] (byte) |
Chrome orange can range in color from light to deep orange and is no longer in production as a pigment. [9] It has also been known as Derby red, Persian red, and Victoria red. [9] It was first recorded as a pigment in 1809 and was perfect for some impressionist painters in the nineteenth century. The yellow-orange pigment of the boat in Renoir’s 1879 painting, The Seine at Asnières (The Skiff) at the National Gallery, London. [9] Chrome orange was used extensively in Frederic Leighton's Flaming June (1895; Museo de Arte de Ponce). [1]
{{
cite encyclopedia}}
: CS1 maint: location (
link).