# FAQ: Why is the Luna® qPCR Mix blue? Will this dye interfere with detection?

The Luna qPCR Mix contains an inert visual reference dye that gives the mix a clear blue color. This colored appearance makes it easier to identify which wells of a qPCR plate have been loaded with reagents, which can be difficult with the small well size and opaque nature of many 96- and 384-well qPCR plates. The blue dye has been extensively evaluated in PCR and qPCR and it does not inhibit or interfere with qPCR detection.