Mars brown is one of the paints listed in William Bouguereau’s notebooks, and it appears in mixtures with white in the flesh tones in his paintings of light-complected people, for which he is widely renowned among artists. As Natural Pigments adds more of the colors I need to their Rublev Colours line of oil paints, I will retire those colors I have from other brands and replace them with Rublev Colours. My preference is for oil paints with no stabilizers in them, just linseed oil and pigment, and I know of no other brand that meets those criteria. This experimental Raman analysis shows the importance of the excitation wavelength for the characterization of metallic oxides with different features.As a realist painter of long-standing, I’m very happy to now be able to add Mars Brown, Transparent Red Iron Oxide, Transparent Yellow Iron Oxide, and Chromium Oxide Green from Rublev Colours to my Number One Paintbox and my palette. In addition, the dependence of the spectra profile with the excitation wavelength for films and microspheres features was observed. For example, when using 455 nm as excitation wavelength the band at 485 cm −1 did not show up, although that when using 830 nm as excitation wavelength is a clear characteristic band for iron–chromium oxide. These measurements have allowed us to observe and identify four Raman bands, among which two have not been previously observed for iron–chromium oxides, and characterize the existence of different resonant excitation conditions for the different excitation wavelengths. Raman spectra were obtained using five different excitation wavelengths from blue (455 nm) to NIR (830 nm). In order to characterize iron–chromium oxides generated by laser irradiation on the surface of stainless steel plates, an ultraviolet–visible (UV-Vis) near-infrared (NIR) multiwavelength excitation Raman analysis has been performed using both austenitic SS304 and ferritic SS430 stainless steel samples. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser. Note the Boolean sign must be in upper-case.
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