This simple kit will enable you to teach the principles behind gel electrophoresis without the need to view the samples on a UV or blue light transilluminator. The kit contains five dye samples labelled A to E with enough reagents to run two sets of six gels. Vial A contains a dye marker consisting all 4 dyes. The other vials B to E contain a single dye. When the samples are loaded into a gel and run on an electrophoresis unit the students will be able to watch the different coloured dyes separate by the size of the molecules, so simulating how DNA separates by different molecular weight.