Quote from Roger:
... the colour observed under short wave is light green (smoky?). ...
That sounds like it is the longwave
result (from the type of uv light that most folk use), not the shortwave reaction.
All of the Ysart weights (excluding Paul's Caithness and Harland periods) I have checked under longwave uv show as Green, but can be various shades. All of the Vasart Ltd (1956 onwards) weights and all of the Strathearn weights I have checked also show Green under the longwave. Ysart weights from the periods mentioned show a shade of Grey under shortwave, but all weights from the Vasart Ltd and Strathearn years show as Blue under shortwave. Paul's weights from the Caithness years (with the exception of a few special training items) also show as Blue under shortwave - but they are not Green under longwave uv.
So, if Roger's weight has a blue shortwave uv result whilst being Green under longwave uv, evidence indicates it was made after 1955 and therefore is not an "Ysart item". And for these purposes I refer to anything made by Vincent Ysart between 1956 and 1964 as being "Vasart" not "Ysart"). However, I suspect that a shortwave uv test would show Roger's weight to be "Ysart" - but without the check, and with that unidentified central cane, there is room for doubt.
Quote from Alan:
... I do not quite follow some of the discussion in this thread. ...
It's always difficult to cover the complex issues of "Ysart canes" in a few words - it's as hard as trying to be concise about the Walsh-Walsh-Old-English-Whitefriars conundrum! And I have still not made much progress with the possible article that I hinted at in another thread (which I can't find right now). I agree that it is not easy to draw a definite conclusion on some Ysart weights. But ...
I have said elsewhere that with additional weights purchased over the past few years I now have many more examples of very good "Salvador canes" but also that I now know that several of those can be found in some of Paul's work. However, where a "Salvador" cane is found in a PY weight, it is usually just one or two amongst many that are regarded as his own, and more often in closepack weights than in concentrics etc.
In Simon's weight all the canes are, in my opinion, of the "Salvador" type and as far as I know none are linked to Paul's work. That is a primary reason for my belief that Simon's weight is, on balance, one of Salvador's.
Maybe I will have submit a "buy at any cost" eBay bid in order to secure the weight for my own future analysis.