Blue Parti
This is also a mutation of the colour Black & Tan,
it is seen very rarely, the colour can as in the examples be more blue or less blue, a young hounds colour can change from light to dark and from dark to light.

Extract of the E-Book by Mr Pete Smith
(copyright Peter Smith) 



Here are some examples:

Boravin Khella


Villeseeker Anton

UK Ch. Boravin Gossamer