I made these guys using two separate tandem batches.
The first with twice-brewed coffee added to the lye (or to be more accurate, the lye added to twice-brewed coffee because you should NEVER ADD LIQUID TO LYE!). I also used coffee-infused olive oil pomace and the last of my precious coffee butter. And coconut oil, palm kernel oil, castor oil, cocoa butter and my old buddy—lard. At trace, I added two tablespoons of sugar (for a little extra lather) and a bit of vanilla fragrance oil. I didn't want to overpower the scent of the coffee.
The second batch was 100% coconut oil (with 20% superfat). At trace, I added powdered milk that I'd dissolved in warm water and my brand new pal—titanium dioxide.
Titanium dioxide from Brambleberry
Is titanium dioxide a natural colorant? No. But it is chemically identical to the mineral pigments that are mined from the earth—but doesn't contain harmful heavy metals. And it's used in as a whitening ingredient in both soap and cosmetics.
Here's a tip on using it: Rather than mixing the powder with oil before putting it in your soap batter, stir it into a little distilled water. It dissolves easily and no lumps.
Anyway, once my two tandem batches were at light trace—dark coffee and white milk—I attempted an in-the-pot swirl, but I'd made too much soap for one pot, so I did a little in-the-pot and a little in-the-mold swirling. I got a little overzealous and some of the swirls blended into a light brown—which actually made me very happy.
More swirls using titanium dioxide will be attempted soon. So stay tuned.