hydrofluoric

[ hahy-druh-floor-ik, -flawr-, -flor- ]

/ ˌhaɪ drəˈflʊər ɪk, -ˈflɔr-, -ˈflɒr- /

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adjective

of or derived from hydrofluoric acid.

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Origin of hydrofluoric

First recorded in 1815–25; hydro-² + fluoric

The emery and excess of hydrofluoric acid may then be thrown into a large beaker of clean water and washed several times.
On Laboratory Arts|Richard Threlfall
In the arts, hydrofluoric acid is used for etching on glass.
Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I|Arnold Cooley
Mixed with hydrochloric acid it may sometimes be used instead of hydrofluoric acid.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
This is a white powder, which is insoluble in acids; even in hydrofluoric acid it is only slightly attacked.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer

Hydrofluoric acid is used for etching glass and opening up silicates.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer