You are the owner of a high-end establishment. Your best bea…

You are the owner of a high-end establishment. Your best beauty pro, Niles, has confessed that the massage oils the employees have been using without incident for many months are now starting to give them terrible rashes and sneezing fits. Which of the following do you use to explain to Niles what has happened?

Jennifer is using a new soothing oil on her clients during s…

Jennifer is using a new soothing oil on her clients during services. The problem Jennifer is running into, however, is that when the mixture is left to sit for more than five minutes, its components separate. Which of the following could Jennifer add to her mixture to solve this problem?