The other day I recieved a MAC Paradisco eyeshadow depot in the mail from an online sale, and when I initally swatched the shadow, it was fine and nicely pigmented.
I decided to heat the label off of the pan and attach a magnet underneath - because there wasn't one attached initally. So I kind of left the depot on my straightener for a long time, about 15-20 minutes (maybe longer) and finished what I was doing. (I had forgotten about it)
When I went to swatch the eyeshadow later, it wasn't coming up - there was no pigmentation. I tried scraping off layer after layer, and still nothing.
It turns out, then when I had left my eyeshadow on my straightener, it "baked" the eyeshadow solid - which explains why I was having trouble picking colour up.
Now, if I were to use this shadow, I have to either:
1) Scrape off a layer and use it as a pigment
2) Dig my shadow and PACK on the colour. This is difficult cause it's REALLY hard to even pick up colour if I swatch it with my finger, let alone a brush.
I just wanted to warn those of you who do depot using a heat method, because this can happen to your shadows/blushes too!