A favorite of immunofluorescence microscopists for decades, this counterstain went the way of the dinosaur when DIFCO stopped making it some years ago (Cat 2340-56).

Now it is back in all its original effectiveness.

Use it 1:20 - 1:40 in your fluorescein conjugates to give a beautiful non-specific red staining background. It is much easier to visualise than Evan's Blue.

5 ml vials, lyophilized.