Daphne Blue was originally an automotive colour used only on the 1958 Cadillac.
Fender picked it up and used it on their guitars between 1960 and 1965 and brought it back again for Claptons Signature series.
Below is pictures of The blue guitar Eric uses as his "go-to" instrument on tour.
It is factory stock. Pics below are from backstage Madison Square Guarden concert 2010
and Albert Hall 2009