Hi Ian,
    With old DAB, quite often you'll get background staining, and sometimes the
labeling is darker.
Amos

Ian Montgomery wrote:

>         My Vector labs DAB kit has gone past its expiration date, by
>quite a  long
> way. Should I continue using it, or dispose of, in a safe way, and buy
> fresh. Any ideas what the effects of 'mature' DAB might be.
> Ian.