I've been hearing a lot about people using Crayola markers to do their gridding. And my reaction was one of horror. Why would you even do such a thing? Crayola is synonymous with staining and tears.
But enough people are saying they're doing it that I felt compelled to check it out. Either it really does work, or there are a significant amount of people out there who don't care about weird stains on their work. But that's absurd, right? Surely the answer is that they work? But how well? So I got a whole bunch of different varieties of Crayola markers and decided to run them through a whole variety of tests. And wound up being a bit surprised.