![]() ![]() ![]() In a small recipe this might be negligible, but the larger this recipe is scaled up, the wider the gap between volume and weight would grow. While this could be viewed as our weights being different, the difference really lies in our volumetric measurements! Afterall, 100 grams is always 100 grams! It’s the variance in how we each measure our ingredients that is causing the discrepancies (in particular the kaolin clay! I must be pretty heavy handed with mine!). Cream of Tartar – 1 tablespoon (12 grams).Look how different our weights are from each other! Here’s why all of this is so important! In the blog post with Amanda’s Basic Bath Bomb Recipe she gives measurements by both volume and weight! While some of the measurements are close, there is still a ton of deviation between the two. (I averaged them out and rounded up or down as needed!) Here is how my measurements looked when everything was said and done The more times you measure and weigh the more accurate your recipe will be, but 3 times seems pretty solid for this little experiment. To convert these I’ll first measure every ingredient by volume 3 times into an empty container on a scale tared to zero and come up with their average weight in grams. ![]() Cornstarch, Tapioca Starch or Arrowroot Powder – 1 tablespoon.Her recipe is listed with measurements for both volume and weight, so we’ll ignore the weights for now and see what happens when I only use the volumes called for! If you’ve tried the recipe and like it (or if others have suggested trying it) and you want to convert it to weight, here’s how to go about doing that! We’ll use Amanda’s Basic Bath Bomb Recipeas a reference and see how closely my numbers end up matching hers! If you’ve found a recipe for bath bombs online it is likely that the ingredients are listed by volume, not weight. Do you mean a level cup or a heaping cup? A sifted cup or a packed cup? Ack! Sitting around and wondering if my idea of a cup is the same as your idea of a cup isn’t what I want to keep me up at night, and yet it totally would. Things like humidity, fragrance oils, and even the same ingredients from different suppliers can have a huge impact on how successful your bath bombs are. There are already so many factors that can cause a batch of bath bombs to fail. C’mon people! It’s about time we get a little scientific with this stuff! If we want reliable, repeatable results with the elimination of as many variables as possible, then weighing ingredients is a MUST! I’m a big advocate for the transition of the bath bomb world from volumetric measurements to weight. ![]()
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