I don't have a sensitive skin and use soap with 20-30 for cleansing without any problems. If your sister has oily skin like me you might want a higher number in cleansing.
I appreciate the skill that comes with making "soap in the shape of ..." but I prefer my soaps to look like soap. I don't even do a lot of swirls. I love the usefullness of soap and want people to use them, not look at them.
I did the same thing yesterday. I made goatmilk soap and put it outside after pouring. Twelve hours later I put the mold in the fridge and took it out 4 hours later. On room temperature it became quite soft so I put it in the oven at 70 degrees C for 3 hours. It turned soft but I knew that would...
It happened to me too a couple of times. I barely insulated the silicone mold and my soap also was cheesecake-like after 2-3 days. I use my silicone mold only for left over soap. The very same batches gave no problems at all in my wooden and pvc molds.
Rhubarb root infused in oil makes a lovely pink color. Maybe if you'd combine it with some alkanet infused oil, it would be more purple? Not sure though, I think I'll give it a try myself.
I cure my soaps in the kitchen pantry where it's cool, dark and dry. But I thought putting the soap in a box with one of these would made more sense because otherwise it would absorb the moist from the entire pantry...
Did anyone ever try getting a harder bar (less moist) with a moisture absorber? Not sure if that's the right translation, what I mean are those white pallets that atract moist. I wondered what would happen if I put one in a box with my curing soaps.
I only made single oil coconut bars and olive bars but I prefer a mixture of oils. I usually combine olive, coconut, sesame, sunflower, castor and wheat germ.
I use a Dutch "kaasschaaf": http://nl.wikipedia.org/wiki/Kaasschaaf. Works fine for me but I'm not sure you can buy them anywhere else than in the Netherlands and Scandinavia.