A thin orange glaze would temper the hard blue. Best to chose transparent pigments. So no cadmium like pigments.

And why orange? Because you go out from primaries. Blue red and yellow.

And to temper a colour you mix the two opposites. Here orange, but if you temper a yellow you use purple mixed from red and blue. And use a green to temper red.

We call this graying down a colour.

Works perfect. But, practise on a scrap piece of paper with blue pigment.