I have a bunch of Wilton food coloring gels in jars that requires using toothpicks to color my fondant/gum paste. In order to color a big batch of fondant or if I need to reach a deep color, I'd have to dip toothpicks in, what seems like over 50 times. Can you just use one toothpick and keep double dipping into the food color or do I really have to go through 50 toothpicks with each color? I don't want to be wasteful and it's only touching essentially sugar, right (?) but I also don't want to shorten its lifespan if I am contaminating it. What do you all do?

When I know I'll need a lot of gel to get a deep color, I'll use a very small spoon such as an 1/8 teaspoon.  Also have found that other gel color brands come in a squeeze bottle.

Adding sugar through double dipping anything can cause Wilton paste colors to go bad.  Once I had gotton quite a lot of cake supplies from a lady who had to retire due to illness.  In there were at least a 1/2 dozen jars of color that were at that time some 20 yrs old and they were still good!  Taking care of your supplies will save you money.   The cost of a jar of color is $$ to the less than pennies you spend on using another toothpick :)