A mass spectrometer having a matrix-assisted laser desorption ionization source which operates at ambient pressure is disclosed. One of several possible insert photographs, name tags, decals, or logos inserts in place on a generally planer surface of a base. % of a cereal-based cover containing at least 20 mg per kg of cover of pro-oxidative mineral selected from the group consisting of iron, copper and combinations thereof; and \u202220-90 wt.