Mixture of Conc. HNO3 n conc. HCl produces lot of fumes which are quite dangerous...!!
This acid mixture should be prepared n used only in fuming chambers...!!
And ya no one will use any concentrated acid as they showed in precap...!!! It will surely fall on someone's skin standing nearby n burn their skin...!!
Fumes are eye irritant but won't cause much problem...!!
Par zyada expose hue to respiratory problems bhi ho sakti hai...!!!