Aggregate respiratory and mucous membrane symptoms were also significantly higher with nitrous acid.

So we say that nitrous acid is more reliable than nitric for etching.

The three classes of diamines may be distinguished by their behaviour towards nitrous acid.

Another method is based upon the different behaviour of the corresponding nitro-alkyl with nitrous acid.

Cupromeronic blue in combination with a series of enzyme digestions and nitrous acid treatment were used.