Emma Stone’s Red-to-Blond Hair Transformation Took 13 Hours

[tiImage width=”623″ height=”400″ url=”http://img2.timeinc.net/instyle/images/2010/wrn/120710-stone-623.jpg” credit=”INF Photo; Jeffrey Mayer/WireImage” align=”center” border=”1″ alt=””]

Emma Stone debuted fresh blond hair over the weekend, a drastic color change from her deep red roots. But this kind of intense transformation, which she did to prepare for her role in the new Spiderman movie, didn’t happen with just a box of dye and a few hours to kill. In fact, it took 13 hours over three days and two colorists—Tracey Cunningham of Beverly Hills’ Byron & Tracey Salon and Marie Robinson, who runs her own salon in New Yorkto create Stone’s golden look. “She has pale pink undertones to her skin, so it was important to find a balance of pale blond with just the right amount of gold and strawberry,” Robinson told InStyle exclusively. “It was tricky because we needed it to be a believable color for Spiderman‘s fans and work for her everyday life.” So, why was the process so intense? As Cunningham explained: “It takes a long time to do it carefully!”

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Emma Stone Goes Blonde for Spiderman

[tiImage width=”300″ height=”400″ url=”http://img2.timeinc.net/instyle/images/2010/wrn/120610-emma-300.jpg” credit=”Jeffrey Mayer/WireImage” align=”right” border=”1″ alt=””]The debate over whether blonds or redheads have more fun is really heating up: Emma Stone debuted her new bright blond strands at the Trevor LIVE charity event last night. Of the drastic color change (which is actually closer to her natural hair color), the actress told us: “It’s my Spiderman hair! Blondes do have more fun! But sometimes I look in the mirror and still feel like I’m wearing a wig.” Stone will play Spiderman’s love interest, Gwen Stacy, in the remake of the movie, which is set to release 2012.

MORE! Try on Emma Stone’s many cute hairstyles with our Hollywood Makeover Tool!

—With Reporting by Andrea Simpson