'Juno seeking from Jupiter the gift of Io transformed', transformed
Cleaning leads to a definitive attribution
Cleaning
The overpaint was removed carefully under the microscope and these pictures show the strongly coloured limbs almost completely revealed.
The picture below shows the final stage of cleaning as the brown leg now sits, disjointed, beside the figure.
The original colours and composition are revealed with the many and subtle shades of red giving a very warm tone to the whole composition, balanced by the equally strong blues and greens.
It is difficult to understand why the painting was altered, but it is possible that the odd positioning of Jupiter's leg and the rooted posture of Juno were considered awkward or inelegant.
The balance of the colours has changed as the thin paint of the background has become more transparent and that too may have been considered unsatisfactory. In the past, restorers did make 'improvements' to paintings if they thought it necessary, although this is no longer the case.