I recently finished a White Widow myself and as the name suggests, it is a white strain, so is usually paler than most other plants!!
If you can get your humidity right down during flower, they will frost up like mad and look the dogs danglies, my RH was between 25-35 during flower, so they seriously frosted up!!
My current grows are running a similar RH and yet again the plants are frosting up like mad, these ones aren't even WW!