The cooking process should bring the water to a full rolling boil for at least one minute before adding the food item (for example, making pasta). If the water will be at a slight boil for a long time, then this will also be protective. For example, you may be cooking beans or boiling chicken for 10 - 20 minutes.
While it varies based on the type of products used and the efficiency of the stylist, it usually takes around 1 1/2 to 2 hours to get hair colored at a salon, according to a poll by Glamour magazine....
Caution: If your hair is gray or white, temporary hair color is not temporary: It will leave a permanent stain on your hair. Semi-Permanent Hair Color: Semi-permanent hair color is made for darkening or adding depth to the hair, not for lightening. It coats the hair much like a rinse, but some types do contain small amounts of peroxide (not enough to lighten the hair). You'll often find an activator inside a home semi-permanent color box, which makes your color darker. This is a good option for adding richness to your existing hair color and will last about four to eight weeks. Be careful applying this color all over.