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The ship, too, quickly transformed into a frozen castle, with frost flowers dangling from the railings and ropes.

Under the right conditions, frost flowers form on top of the ice, a red flag that it is dangerously thin.

"The sparkles visible in some segments were from the sun gilding the frost flowers that had formed on top of the new ice overnight—icing on the cake!"

And frost flowers have been photographed at Haddo House and Country Park near Tarves in Aberdeenshire.

They bear a very close resemblance to the arborescent frost flowers seen on window panes in winter, and to the stellate snow crystals.