What would the reaction be for the clear dome, under shortwave UV for this weight ? Is it blue ?
Which weight are you asking about? I guess it is the one that you started this thread with, but, if so, without checking it, I couldn't possibly say what its shortwave uv reaction would be! I suspect it would be the same as my example - Blue - as stated in the Ysart Glass web page. But it might not be!!
Are you saying that older pre-war weights don't have this reaction under longwave (green) or shortwave (blue) ? Later ones , including Strathearn , do ?
My distinction was not simply between pre-war / post-war weights.
The periods under consideration are:
1) Pre-war Ysart 1930s
2) Ysart Brothers Glass (trading as Vasart) 1946-1956
3) Vasart Ltd 1956 - 1964
4) Strathearn 1964 - 1980
The glass batch for 1) and 2) was soda-based (i.e. not a lead glass), with normal UV reactions of:
longwave = Green, shortwave = Grey (to my eyes)
The glass batch for 3) and 4) was lead-based, with normal UV reactions of:
longwave = Green, shortwave = Blue