A small green light in a darkened cabinet
On the quiet theatre of uranium glass, the inheritance we carry without knowing, and why my grandmother kept her good creamer beside a forty-watt bulb.
My grandmother kept a custard-yellow creamer on the third shelf of a walnut cabinet in the back room of her house in Whitby, and once a year, on the evening before her birthday, she would walk us all into that room with the curtains drawn and switch on a small ultraviolet tube she had bought from a mineral collector in Leeds. The creamer would answer in a green so loud it seemed indecent — a colour I have not, in thirty years of looking, quite found again.
It was Vaseline glass. The pressed sort, made somewhere in the Midlands in the 1880s, doped with two per cent uranium oxide because that is what you did then if you wanted a pretty pale yellow that caught the gaslight. The radioactivity was not a secret. It was a selling point: the catalogues called it "canary," and the better firms — Davidson, Sowerby, a few of the Pittsburgh houses — pressed it into spoon-warmers and salt-cellars and the small footed bowls a Victorian hostess was expected to own four of.
What the blacklight knows that daylight does not
The object is the same object. Only the question has changed, and with it, the answer the glass has been waiting a century to give.