Laura Mercier created all these Secret products to go together – what an ingenious ploy. I'm not sure about the entire collection, but this and the Camouflage are worth every penny. Dust this ultrafine powder onto your face to minimize imperfections and create a lightweight finish. It’s can be an alternative to powder and used as a highlighter. I wouldn't invest in this for everyday use.

Full review and photos: http://gracefulglutton.blogspot.com/2010/08/other-laura-mercier-secret-brightening.html

I've been using this for the longest time... i can't even keep track of how many i've repurchased. The powder has a white tint and have two different colors. I have a darker skintone so I use number 2, which is slightly warmer, and has a bit more color. I use this after i've applied my concealer. I wouldn't say it does a whole lot of brightening but it's so finely milled that it's the perfect set powder for any of my concealer. I apply mineral makeup afterwards and it doesn't smear my under-eye concealer. It's a bit pricey as a powder just for the undereye area, but it does last pretty long. The only thing about this that i dont like is when i put this powder on top of my foundation, and i take pictures with flash, it creates a really scary white glow/cast under your eye.. not pretty. So now i just use it under my foundation to set.

After spending hundreds of dollars looking for a product that did what it claimed in disguising under eye circles, I finally found the perfect one in Mercier Secret Whitening Powder. I apply it after my foundation (but b4 blush) from the dark under eye area down onto cheeks for a uniform look. Then apply blush and the circles are visibly gone.