The luminous pinkish tones of female and infant flesh were composed of lead white, lightly tinted with vermilion and red earths in shadow areas.
Highlights were indicated in this way, which were further strengthened in some areas (e.g. located at the Saint's left knee) by adding a successive layer composed of lead white and vermilion.
The oxygen evolution reaction (OER) during the electrolysis of electrolyte-free water on a gas-evolving anode composed of lead dioxide microfibers (MF-β-PbO2) was studied in a solid polymer electrolyte cell using the electrochemical impedance spectroscopy (EIS) technique.
The analysis zone corresponds to Saint Peter's head: copper (a) in blue pigments (azurite); mercury (b) in red pigments (cinnabar); sulfur (c) associated with mercury for the red pigments (cinnabar) and with arsenic (d) for the yellow one (orpiment); lead (e) in white pigments composed of lead white; Gold (f) is present in the gilding zone, in the background of the scene.
Interestingly, the black patches seem to be composed of lead oxide (which, as PbO2 Plattnerite, could also contribute to the blackish colour of the patch), mixed calcium and copper carbonate (Ca0.6Cu0.4CO3) with the excess of copper in form of mixed Cu(OH 2/CuO in a ratio of 3 1.
A cross-section, taken from a white stripe of one of the purple petals, confirms the presence of an underpainting on top of the double ground composed of lead white, red lake, and some vibrant red particles, most likely vermilion (Fig. 5b, c, layer 3).
Composed of lead vocalist and guitarist Jack Black and lead guitarist and vocalist Kyle Gass, the band has released three albums – Tenacious D (2001), The Pick of Destiny (2006) and Rize of the Fenix (2012).
In this paper, the microgrid system is composed of wind turbines, solar cells, lead acid batteries, diesel generators and loads (partially controllable).
This was to be achieved by setting forth a number of "first principles" concerning the continuum akin to the axioms and postulates of Euclid's Elements and then demonstrating that the further assumption that a continuum is composed of indivisibles leads to absurdities (see Murdoch [1957]).
The obtained porous silica samples were impregnated for 4 h into an aqueous solution (S) composed of the lead acetate as a lead precursor and of thiourea as a sulfur precursor.
