Black Magic is the name of today's technique, as it involves embossing with white on a black or dark cardstock, then coloring over that.
Tantalaya's card certainly looks magical as it almost has a glow to it.
I used a stamp set from Stampin' Up! and I heat embossed it in white and then used my Spectrum Noir markers to color in the flowers and stems. I then white embossed the sentiment as well and I attached it to the card base on top of pattern paper from DooddleBug Kitten Smitten 6x6 pad. - Tantalaya