Dr. Grace Dzido, MD is an internal medicine doctor who practices in Roanoke, VA. She is 54 years old and has been practicing for 19 years.
The Loading Dye * Loading dye is a colored buffer mixed with the DNA prior to loading onto the gel. The loading dye contains a relatively high concentration of either glycerol or sucrose. This makes the solution more dense than the surrounding running buffer so that when a sample is pipetted over top of a well it sinks down into the well.
After production, the fiber is then dipped in the dye to add the color. (This is a very over-simplified explanation of the process, but it provides the general idea.) In the solution dyeing method, the color is actually added to the liquid state of the fiber components, before the fiber is actually produced.