Yes. And though there are all sorts of different ways to go about it, we've found that the easiest way is simply to melt down your old wax and then mix it with new wax. This can be done by putting the old wax in a pot on the stove over low heat until you see it start to liquefy. Then, add more new wax until you have a mixture that looks like it will pour easily into the jar. Pour this mixture into the jar and allow it to cool completely before lighting.