If you formulate solid shampoo bars, two ingredients appear again and again: Lauril sulfoacetato de sodio (SLSA) y cocoil isetionato de sodio (SCI). Both are anionic surfactants commonly used in solid cleansing products, and both can be used in syndet shampoo bars. But they are not interchangeable ingredients. Formulators frequently describe SCI as contributing a dense, espuma cremosa, while SLSA is often …