Posted by a reviewer on Amazon

Works great they come dry and you have to push them in to get the ink to the tip

Posted by a reviewer on Amazon

Kind of hard to get color at first lots of shaking the marker and pressing tip down before it let down the liquid color

Posted by a reviewer on Amazon

The directions on the pens say to press down on the tip a few seconds until the ink fills the tip

Posted by a reviewer on Amazon

I read many reviews on different liquid chalk markers from different sellers here on amazon and i finally settled on these because of positive reviews

Posted by a reviewer on Amazon

Its also very easy to wipe off the board too and does not leave any ghosting

Posted by a reviewer on Amazon

The reason i took away a star is that three of the colors are not actually fluorescent

Posted by a reviewer on Amazon

Pushing down on the marker releases a valve to allow the ink to flow so no ink will flow unless the tip is depressed

Posted by a reviewer on Amazon

I havent tried it on a white one yet but i would imagine they would work fine