Liquid Castile soap is an oil-based soap that can be adapted for everything from personal cleansing to household cleaning. Learn how olive, coconut and other oils affect cleansing, lather and thickness, why different Castile soaps behave differently, and how to choose the right character of soap for the job.
Cold process soap is shaped by much more than its basic recipe. Learn how oils and butters influence hardness, lather and skin feel; how fresh ingredients, powders, fragrance and other additives affect a bar; and how formulation, troubleshooting and artistic design fit together.
Artistic soap design starts before the soap is poured. Learn how to break an inspiration image into colours, gradients, textures and recognizable elements—and why planning the composition matters as much as adding decoration.
A beautiful-looking soap is not necessarily a correctly made soap, and an unattractive bar is not necessarily a failed one. Learn why pH is an important quality check and how it helps distinguish an aesthetic problem from a more fundamental formulation issue.
Cold process soap can be made without palm oil, but removing it can change the hardness and longevity of the finished bar. Understand why replacing palm oil is not always straightforward and why a shorter-lasting bar is not necessarily a failed soap.
Cold process soap does not automatically need added glycerin because glycerin is already produced during the soap-making process. Learn why it remains in the bar and how adding extra glycerin can affect softness and moisture absorption.
Cold process soap can contain liquids, fresh pastes and purées, botanical powders, clays and physical scrubs—but they don’t all behave in the same way. Learn why the form, texture and amount of an additive matter to the finished soap.
Cold process soap can sometimes change from fluid and manageable to unexpectedly thick. Learn why over-blending and certain essential or fragrance oils can accelerate thickening, and why losing your design does not necessarily mean losing the soap.
Essential oils and fragrance oils can both give cold process soap its scent, but they are not interchangeable. Understand their different roles, how their scent can behave and why some fragrances can make soap thicken unexpectedly.
What makes one cold process soap firm while another stays comparatively soft? Learn how hard and soft oils, butters and lathering oils influence soap hardness—and why making a harder bar is ultimately about balance.
