However, an alternative is that similar colour elements might be homologous and transferred between species through occasional hybridization and backcrossing events [ 20].
Colouring element is cobalt, in the flake I/3b also copper (Table 2).
Furthermore group CL3 presents, as expected, very low levels of Co, Cu, Pb, Sb and Zn, and any sign of recycling can be deduced from the samples under investigation, with the exception of D7, deeply coloured in blue, in which the very high content of lead, copper and cobalt is related to the intentional addition of colouring elements and/or coloured cullet.
All three flakes contain MnO, I/39b1 also traces of Fe2O3, but no other colouring elements (Table 2).
Although the colouring elements resemble mostly contemporary recipes as known from Neri and his translators, the glass composition is clearly different and differs also from other lead glass compositions from that time.
A wide range of analytical data obtained from early eighteenth century glass flakes is presented here and is discussed with regard to the composition of lead glasses, colouring elements, and manufacture details.
Prismatic colour, the element in Cézanne that the Cubists had neglected in dismantling his style, was taken up by Robert Delaunay.
Furthermore, apart from temporal contrast, we know relatively little about how the R-LMC-R system contributes in transmitting other features in the natural scenes, such as colour, line elements, orientation or motion, to the fly brain, or how the same network structures may be used for different processing tasks simultaneously.
The F1 hybrid males were successfully backcrossed to females of both parents: H. atthis, H. hecale, and also outcrossed to a third species, H. melpomene (which itself had some colour pattern elements obtained by hybridization with H. cydno).
