A push liner brush is a brush that has a square brush head and very stiff bristles. Just like the one below with the cream coloured handle. It is the perfect choice of all your makeup brushes to put on a liner colour.

The idea of these brushes is to push dark colour into the very base of the lash, creating what looks like a very thick lash line. It is also a perfect way to create a straight line at the base of your lashes without having to draw a thick harsh line.

I use mine with a Bobbie Brown liner colour. That would be the very darkest colour from this palette here.

Or I use it with a Laura Geller chocolate colour baked shade, as this give a more subtle look and is perfect for smoking out with a smudge brush like the one picture here.

I am a huge fan of push liner brushes and have purchased around three or four identical ones so that I create either a strong lash line or smoke it out with a smudge brush like this this fabulous No 7 brush Smokey Eyeliner brush from Boots.