Isabelline or Isabella Grey is the name of this colour I believe.
This particular colour kept popping up in bulb catalogues selling bulb vases.
In the 1870s you could buy a certain vase in the colours Jet, Turquoise, Green, Rose du Barry and Isabella Grey. Very choice they said!
Naturally I looked up this Isabella Grey and came across the story of the Infanta Isabella Clara Eugenia of Spain.
It's worth a google!
And for what it is worth; the vase is believed to have been made in Bohemia for the English market.
Patricia