This inexpensive procedure utilizes the Gomori Iron reaction method. It avoids the time and preparation of caustic, poisonous materials. Each dropper contains two glass ampoules filled with reagent. When broken and mixed, they are ready to stain up to four slides at a time. Each package contains 12 dropping units and Nuclear Fast Red counterstain. The sturdy plastic box can be used as a humidity incubator for the slides. Scientific Device Laboratory also carries Iron Control Slides in boxes of 10 or 50 slides.