title: The impurities of biological dyes: their detection, removal, occurrence and histological significance--a review.
mesh_terms: D055598:Chemical Phenomena; D011232:Chemical Precipitation; D002621:Chemistry; D002623:Chemistry Techniques, Analytical; D002845:Chromatography; D002850:Chromatography, Gel; D004396:Coloring Agents / Q000032:analysis / Q000302:isolation & purification / Q000592:standards*; D004586:Electrophoresis; D006651:Histocytochemistry; D007474:Ion Exchange; D012492:Salts / Q000302:isolation & purification
chemical_list: D004396:Coloring Agents; D012492:Salts