potassium sorbate and sorbic acid as the only preservatives in a product. Neither of these are what we call broad spectrum preservatives, ones that will take care of bacteria, fungus, yeast, and mold, so you have to pair them with another one. Neither of these are good with bacteria, so pairing them with phenoxyethanol or Optiphen or another effective bacteria beater is a great idea!
In this post, How do you know when to add an ingredient?, Tiffany asks: My first question is about the cool down phase. The stuff you add in this phase do you just add it when the temperature is right or do you dilute it with water or oil first then set it aside? Then add it when the lotion has cooled? I really may be nuking this but I can't seem to find anything on the subject?
Second question. Can you fully replace the water in a lotion with aloe vera juice or a hydrosol? I have been trying to find an answer for this but have come up empty handed.
Yes, you just add the cool down phase into the container when the temperature reaches 45˚C. You don't need to mess around with it. Just weigh it like you would the other ingredients directly into the container. Something that needs to be diluted, like a powdered extract or preservative, can be mixed with a titch of warm water to get the process going, but you could just put it into the container and let the warm water dilute it.
Creating products: The cool down phase
How do you know when to add things?
Learning to formulate: The cool down phase
As for your second question, no, you don't want to replace all the water with something else. Water is an important part of our lotions - it's not just filler. Plus all those lovely things you want to use instead of water contain electrolytes, which can throw off the emulsion or the preservative. Better to use no more than 10% aloe vera or 10% hydrosol and add distilled water for the rest.
Water isn't just filler