I did a test batch of soap with Blueberry fragrance oil several months ago and was happy with the results. No acceleration, no discoloration and the scent stayed sweet and true. So I soaped this a month ago. Much to my surprise it discolored- this was the same oil from the same company. I was puzzled. I used the same ratio of fragrance to soap as in my test batch. I had portioned my raw soap out into two different bowls, I added the fragrance to the majority of the soap along with some titanium dioxide- I was looking for something blueberry ice cream like. The second portion I added blueberry fibres and some purple and blue dye but no fragrance oil or titanium dioxide. Well now its a month later and suddenly the scent has faded. Im  not sure whats going on with that! I am curious if the company didnt change their formulation. I need to do a few experiments on the cured soap to see if I can bring the scent back. Its a beautiful soap even with the discoloration. I do not want to rebatch it!