which is supposed to give the same appearance as with niello but with a different chemical composition. This hypothesis was based on the detection of iron in the black coating and an interpretation of Theophilus' recipe "Colorando auro" 2,3. As a consequence, all the gaps on the statuettes were fi lled with black micro-crystalline wax and the dark colouration was re-homogenised during the restoration in 1969. When the shrine returned to the KIK-IRPA in 2005 (see fi g. 1 upper part), the assumption made in 1969 of intentionally blackened gilded silver by applying "pseudo-nielle" was reconsidered and called into question for three main reasons. Firstly, there was no evidence of the use of "pseudo-nielle" on