Bob Ross® Prussian Blue Oil Paint

Bob Ross® Prussian Blue oil paint is another heavily used color with the wet-on-wet method. Usually you'll use prussian blue for sky scenes, water, and often as part of the dark base mixture for mountains. If you paint often, the 5 oz tube will be the way to go, otherwise the 1.25 oz tube should last you quite awhile. 

If you cannot find a local retail outlet for Bob Ross® Prussian Blue then you might consider buying from a reputable, high-volume art supply dealer online. The normal list price for the 5 OZ tube of Prussian Blue is $15.49 and the 1.25 OZ is lists for $6.29 but you can buy it online for far less. The buy link below doesn't commit you to buying, but will take you to the merchant website where you can see what is available.

Bob Ross Landscape Oil Colors 150 ml prussian blue Specially formulated to a firm consistency for Bob Ross' painting techniques. Every batch is individually tested for perfection. Non-toxic. Landscape Oil Colors come in 37 ml and 150 ml tubes.