Ampicillin resistance screening.

[Stefan Albert Bledig]

A commercial product (Ampscreen) was previously available from Gibco/BRL which
enabled colorimetric screening for ampicillin resistant bacterial
colonies.  Does anyone know if such a product is still commercially
available?  If so, by whom?  If not, does anyone know the chemical
composition of the colorimetric screen so that home-made screening disks
can be made?

Thanks,

Stefan Bledig