The pure lazure technique uses beeswax, tree resins, and is a multi step process that takes some time. I use the stockmar watercolor paint and flat glaze. If it gets to bright, I sometimes go over it with white pigment in glaze. I use a wide soft technique brush. You can get these at upscale hardware stores now. Unless you can get to a workshop and learn the official way, I would recommend just trying it out. The goal is less is more, and take your time!
Good luck, and let us know if you find other links/resources to guide you!