Yale blue:

[…] the perfumes and flavouring-substances, the explosives, the viscoses, celluloids, xylonites, bakelites, &c., […]

In the concluding pages of this minisaga (Herodotus 1. 90-91), Croesus sends to inquire of the priestess of Apollo why the oracle had misled him.

They are (said he) meer phantoms of ignorance and credulity, swelled up in the repetition, like those unsubstantial bubbles which the boys blow up in sopasuds with a tobacco pipe.