Here are the soaps I‘m not entering for the challenge.
For the first soap, which had four layers, the colors are quite interleaved. The layers were poured at 90 deg from the spout of a batter bowl (2000 ml). This was a huge pouring vessel compared to batch size (450 g oils) and the spout is broad. The batter for each color was passing through/over the spout simultaneously for much of the pour. The colorants are indigo, annatto, with a little AC added to the darker indigo layer. The soap is scented with lemongrass EO.
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For this next batch (450 g oils), I made a pink base batter using madder tea for the water and a little TD to add some opacity. The split layers were colored with strongly colored paprika, rhubarb and alkanet infused oils until I achieved the colors I wanted. The two warm color layers are scented with NS Satsuma and the two cool purplish layers are scented with NS Lavender and Sage. The acceleration of the purple layers had me scrambling and I forgot to take the crucial photo, but this batter was poured at about 45 deg from the spout of a 1000 ml measuring cup. I added the layers in the order shown below, from left to right. I had no idea how it was going to turn out because the purple and orange layers seemed to be moving at different speeds on the way into the mold.
I LOVE this soap! I don’t think it looks ridged IRL, but I can’t seem to get a better photo.
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In case anyone is interested, I made the concentrated oil infusions using the method Chass of Wild Plantanica uses to make hers. It makes adding botanical colorants almost as easy as adding micas.