I think that there is some confusion/disagreement on the amount of SiC in Marilee’s Lava, possibly due to a historic typo. Glazy gives +0.34 https://glazy.org/recipes/24043 While this paper gives +3.5 https://www.thestudiomanager.com/posts/tag/lava+glaze Many recipes list the silicon carbide in this glaze as 0.34, but I’ve seen enough others arguing that was originally a typo many years ago, so I went with the 3.5% recipe.