This will be the last blue mascara review for a while. I tested and loved quite a few- blue mascaras have definitely come a long way since the 80s and its pretty easy to find a good one. The general rule is that brands that make a good mascara are more likely to offer something nice in blue.
I loved the black YSL Volume Effet Faux Cils from first testing. It's a great volumizer and holds a curl beautifully. It comes in several shades and Number 3, Extreme Blue is one of the options (there's also a blackened navy which I haven't tried. Yet). Obviously, on very dark lashes the color is not that bold, but it stands out a little more than the Buxom blue mascara that looks similar on the wand. This is probably due the thicker YSL formula that gives lashes a heavier coat. Still, it's very wearable and not loud at all- the blue just brightens things up a notch and looks pretty against beige and champagne eye shadows.
Volume Effet Faux Cils is quite resilient and stays on nicely, though I had one smudging occurrence (in three months of testing) after touching my eyes on a super humid and rainy day. From what I understand, the Volume Effet Faux Cils performs better when it has something unto which it can hold. It might not be the one if your lashes are very sparse, but for me it's an ideal product because it boosts the appearance while the blue shade is keeping things from looking too harsh or dramatic.
YSL Volume Effet Faux Cils mascara ($30) is available from select department stores, Sephora and the company's website.
All photos are mine.