Cake: Solid when dry, cake eyeliner is activated with a wet liner brush (like some watercolor paints). Affords a lot of flexibility.

Liquid: Eyeliner that comes in a bottle like ink. Requires a separate brush. Has a rich, lush quality but can be more difficult to control

Felt tip: Sounds like what it is: an eyeliner that looks like a felt tip pen. Has the ease of a pencil but the staying power of a liquid.

Pencil: The easiest liner to use. Ranges in texture from dry and hard to soft and pastel-like. Dry pencils can pull at delicate eye tissue; very soft pencils can bleed over time.

2torial #0625: Learn2 Apply Eyeliner (Continued)   Prepare your instrument Follow these guidelines so your liner will emit a thin, controlled line when drawn along a clean patch of skin (we'll use a hand here, but you can improvise). Once you've got the thickness to your liking, you can apply it to your eyes.   If you're using a cake: Moisten the eyeliner brush with clean water then draw across the liner cake. Draw a line to test the thickness and density. Add more water or liner as necessary. If you're using a liquid: Barely moisten the brush, then dip just its tip into the liner. Test the line; adjust fluid amount accordingly. If you're using a felt tip: Test liner flow by drawing very lightly on your hand. If tip is dry, give the liner a few sharp shakes to force more fluid to the tip. If the tip is too wet, draw it against your hand (or a lint-free cloth or cosmetic paper) to remove excess. If you're using a pencil: Sharpen the tip enough to produce a line to your liking. If too sharp, you can blunt the tip by drawing on a tissue. Step 2