Hydrofluoric Acid

Bone-hurting juice.

Hydrofluoric (HF) acid, one of the strongest inorganic acids, is used mainly for industrial purposes (eg, glass etching, metal cleaning, electronics manufacturing). Hydrofluoric acid also may be found in home rust removers. Exposure usually is unintentional and often is due to inadequate use of protective measures

Hydrofluoric acid-t or "3HF" or "TF" is HF (hydrofluoric acid), but with Tritium instead of H, H2 (D),

Person one: What is that
Person Two: that's Hydrofluoric acid-t
Person one: *RUNS because of fear of TF*
Person two: It's just HF...

Yep, sometime it gets confused for another TF, don't ask why...