Over the years many mutations have been reported which produce a (relatively) clear yellow or white body with normal black or dark wing markings, approximating to the beautiful painting of a (hypothetical) "laced Yellow" by R A Vowles shown in Dr M D S Armour's book, "Exhibition Budgerigars".
He said, "The body colour is changed from blue or green to white or yellow and the wing barring, flights and shaft feathers become jet black.
He goes on to say, "the clearness of the body and the darkness of the wing barrings depends on the strength of the factor in the individual bird", indicating the variability in residual suffusion and the intensity of the black markings.
In January 1958 this hen was paired to a normal Dark Green cock and two further mutants were bred in a nest of four chicks, both cocks, with yellow bodies, black wing markings, black long tail feathers and pale violet (lavender) cheek patches, one in Opaline form and one Normal.
In a series of experiments, Mr Easley determined that the suffusion and depth of wing markings were variable, but the lavender cheek patch remained an unchanging characteristic.
It appears Mr Easley did not dispose of any of his 'Laced Clears' until 1965, when he placed the first advertisement offering them for sale in the American Budgerigar Society Bulletin.
It seems likely that all the Dominant Clearbodies in Europe, including the UK, are descended from the original two imported by Herr Molkentin from California in 1990.