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Perspective lines

x-ray image, showing clear white outlines of vaulted arches and a figure in the pulpit

X-ray of a detail of the painting, showing St Bernardino and the architectural features behind him

In the x-radiograph the incisions can be seen clearly where they have filled up with x-ray dense paint and appear as strong white lines. The perspective lines were incised using a straight edge but most of the other incisions were made freehand - for example San Bernardino’s halo and the curves of the apse vaulting.

Detail of the same part of the painting shown in the x-ray above, as it looks after conservation