Part of the reason that I use the calculator program is so that I don’t have to do a lot of math. Unfortunately, I have found most of the formulas it provides are considerably higher than what they should be for example: 7 ounce candle, 7 containers, 12% fragrance oil, and it provides enough wax for just shy of 9 - 7 ounce candles. I got this app because I could no longer find access to the one that I used to use, which was very accurate. all that being said, I can still work with this as it still does basically what I need it to do. I just have to modify based on experience using the app.
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