Today I made butterscotch! I started by mixing water, sugar, brown sugar, salt, butter, and white vinegar together in a sauce pan, and when it reached 270 degrees, I added vanilla extract. I then poured the mixture onto a Silpat, and scored it with a paring knife as soon as it was cool enough. There were a few spots in it where there was undissolved sugar, so it caught in the knife and dragged through the rest. I think that the look can change the taste sometimes, but that's if it's burnt. In this case, it tasted fine. I highly recommend making it if you have the time and ingredients.