Dock Icons with red tint

[patterner]

Moin moin

suddenly the icons for OmniGraffle and OmniOutline have a dark
red tint (OmniWeb is still normal). The applications still work, but
I wonder what caused it and what to do to restore the original colours.

[JKT]

Have you used a hack such as Labels X to colour code folders on our system and inadvertently applied it to OmniGraffle and OmniOutliner?