An "orangey colour" could indicate either PY at Caithness or Harland.
However, in most cases I now agree that the "orange" longwave uv result for PY weights from the Caithness period is actually a distinct "watery" yellow or orange. For Harland weights some people report "no fluorescence colour" but I see an "orangey" colour for most of my examples. although it is not the clear "watery" orange of the PY Caithness weights and certainly not the "yellow" shade of many.