We purchased a mini bench top centrifuge for approx $200. Spins six
microcentrifuge tubes up to 2 ml size.  We spin for just a minute or so.
The centrifuge has one convenient speed, and works like a charm, takes up
very little bench space, saved the day! If the chromogen is clumping, have
had that happen with some, I mix, put through an inexpensive non sterile
0.45 um syringe filter (Fisher) and use immediately.  

Fisher and VWR both sell microcentrifuges, will discount



Gayle Callis
Veterinary Molecular Biology
Montana State University
Bozeman MT 59717-3610
406 994-4705
406 994-4303