I love the white Miracle Chalk pounce. Used with a stencil, it's fast, and makes an easy to see line. I once had trouble getting out the blue chalk, so I don't use that at all anymore. I never did get it all out.
About the only other things I use for marking are a chaco liner (a tube with a tiny wheel that dispenses a super fine line of chalk) and Roxanne's white and silver pencils. All these are safe, none will damage cotton fibers over future decades. I don't want to spend so much time and money creating something then chance it falling apart in the future where lines were marked with damaging chemicals. So I'm very conservative with marking tools.