Tissue Marking Dye - FIX The Fix solution is a support designed to improve adherence and protect dye colors without interefering with tissue processing and staining The Fix solution is a fixative spray, which can be applied on a sample once marked with dye, or before it is marked. The product is a fixative that modifies the surface of samples to facilitate the adhesion of the dye. Suitable for all types of samples, especially recommended for fatty tissues.