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BB's website says that the LCP soap is also more cloudy and opaque that the regular clear, so it would not be a good choice for embed projects.
For measuring fragrance, it
is best to weigh it and go by the recommended usage rate of the fragrance, like Rosie said. Honestly, though, when I make M&P, I just drop my fragrance in until I like the strength of the scent. I don't have a small enough scale to measure tiny amounts of fragrance, and I don't sell my soap; just make it for myself and my family, and occasionally a friend. If I was selling it, I'd be more precise and invest in a small scale. As for number of drops, I tend to use about 7-10 drops per oz. for whatever reason. However, when talking in drops it can get tricky. The size of your drop could be different from the size of my drop. The type of fragrance, the size of the dropper, and the angle you hold the dropper at all affect the size of the drop. That's why measuring by weight is ideal. But if you want an average, I tend to use 7-10 drops per oz. So in your case, if you were making a 4.5 oz. bar, that would be 31-45 drops, depending on the strength of the fragrance and your nose's tastes.
If you want to try out different types of M&P bases yourself, Bramble Berry has a M&P sampler kit with a pound each of Clear, White, Hemp, Aloe, Honey, Shea, and Goat Milk bases.
Hope this helps.