View the invisible with diagnostic dyes

Dyes have a multitude of uses, from making clothes more vibrant, to uses as therapeutic agents for humans and animals. However, with specific relevance to haematology, cytology and histology, some dyes have taken a pivotal role in improving healthcare, allowing us to examine cellular features in clear and colourful detail. Here, we explore a selection of these biological dyes, their histories, chemistries and applications.