Have you ever considered whether you should pour the water into the oil or the oil into the water when you're making lotions? I usually add the water to the oil because the water phase is always the largest phase. I'm using my larger container for the water phase, so it just makes sense I'll continue the lotion making process in that jug!
So which should it be - oil into water or water into oil? The emulsion - both mechanical and chemical - are going to work in any order, right? No!
When you're making an emulsion, pouring the water into the oil phase forces an inversion, which makes the emulsification more stable!
This is huge! This can make all the difference between a great lotion and a watery, annoying mess! I've been fortunate in that I've had exactly three batches of lotion fail to emulsify, and the reasons were very clear in each case - I didn't heat the water and oil to the same temperatures, I included a very acidic ingredient, and I was using e-wax instead of Polawax - so I've never really researched emulsification much. This, however, changes everything!
I'm out of hand lotion - I know what I'm doing this morning!
For more information on this topic, check out this link at Lotioncrafters!