Salt Dough

For some reason I have a hankering to play with salt dough today, but I can't remember which recipe I used to get the whiter finish.  The love tokens and the charms were both made over a year ago using different recipes.  

The charms came out a better shade of white.  They are thinner than the tokens, and they were allowed to air dry for many days.  The love tokens were place in a low heat oven.  Maybe that was the difference.

I want to make pretty salt dough bowls.  

I want to get good spring pastel colors when I make them.  Does anyone have any tips for whiter dough?  Thanks in advance :)