Because the MOD1 version is currently in a "grey market" status. The original -1.2 formula contained trace amounts of hydrolyzed collagen, which caused an allergen warning for vegans. The MOD1 update removed the collagen, replacing it with a guar gum/xanthan gum hybrid, but this changed the mouthfeel.
Normal milk has a surface tension of roughly 52 mN/m. For tulips with 7+ layers, you need that number to drop to ~45 mN/m, allowing the foam to flow without collapsing. Eliza-s Secret Potion -1.3-MOD1- -latte art-
Enter the shadowy, community-driven legend of Because the MOD1 version is currently in a
However, purists argue that latte art is a skill, not a formula. If you cannot pour a solid heart with raw milk, the potion will not save you. It amplifies existing skill; it does not create it. Normal milk has a surface tension of roughly 52 mN/m