Pilot Latte Gel Ink Pen - 0.5 mm - Pastel Color Series - Mauve Purple

I was expecting something similar to Sakura Glaze pens, but these are different. The colors are brighter than you'd think, too.
I tried writing on different materials: YES, I really did test every claim. They write on regular notebook paper, glossy magazine covers,patent leather, vinyl, wood, coated and uncoated cardboard, plastic ( the case the pens came in, for ex.) enamel-coated metal, glass, Pyrex, and stainless steel.
They write on shiny metal and plastic but some of the shiniest, smoothest surfaces will cause the ink to bead up via surface tension. When other reviewers complained of these "not working," they probably were experiencing the same problem as I did when some pens simply refused to put ANY ink out. All you have to do is draw straight lines quickly on an absorbent surface, like regular notebook paper, a paper towel or a scrap of fabric to get the ink flowing again. Just one or two quick swipes is all it takes. They really DO write on almost everything!

this white pen writes perfectly on plastic surfaces, but, in paper, its useless...

I also had miserable results with this "white" pen. As the previous review said, it goes on clear then dries to a barely visible white. Very faint on black cardstock. Virtually useless.

This pen is terrible. It glides on as more of a clear ink then white. I wanted to use this pen to add to white highlights but it is not useful in anyway.

WORST PRODUCT I'VE EVER PURCHASED FROM JET PENS. I LOVE THIS COMPANY, THOUGH, AND 1 OUT OF 30-40 PENS I'VE PURCHASED, THAT'S NOT A BAD TRACK RECORD. mAYBE THERE'S A TRICK TO MAKING IT WRITE....I'D BE HAPPY WITH ANY COLOR, JUST SO SOMETHING WOULD COME OUT AND LET ME WRITE WITH IT. wHAT WAS PILOT THINKING ????? tHE ONLY REDEEMING VALUE IS, IF YOU HAVE A GREAT TAN AND MANICURE, IT SERVES AS A GREAT FASHION ACCESSORY.