Actually, it is Teri Endsley, but with one “r” in Teri and I’ve also seen her use a palette knife for oxides.
https://www.greatcakessoapworks.com/handmade-soap-blog/index.php/secret-swirl-winners-revealed/
https://www.greatcakessoapworks.com/handmade-soap-blog/index.php/secret-swirl-winners-revealed/