I have always thought that Stamford shed had a great deal of character. I built the 4mm scale Prototype Models kit some 20 years ago. I retrieved it from a storage box last year and decided to refurbish it with regard to gutters and downpipes, and to scratch build the wooden extension, rarely modelled. The only snag was that, in my original build, I overlaid the printed roof with slate paper strips, using PVA adhesive. Whilst in storage, this had turned green, so the extension is roofed with different coloured slates from the original build.
I have heard of ballast turning green due to the use of PVA but not previously building papers. Has anyone else encountered this?