Wasn’t aware of the macro/nano difference .
Brass can be supplied in very “tight” recipe. .and similarly in very loose recipe.
As can many other materials used…
For example bronze. .
These “alloy”..to some extent are just mixtures.
Tin/lead solder for instance is called a eutectic mix ( ironically more an alloy than mix )..where does this leavw us?
Well there is a reason why certain fittings/parts are specified in bronze rather than brass…
If nothing else tin is much less reactive than zinc ..and would not fizz away and leave the amorphous copper stranded.
Btw alibronze..anyone?