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Thanks, you have significant knowledge! I wouldn't necessarily dismiss 'peanut butter' as a type of abrasive. In the food industry, one term oft-discussed is 'mouth-feel' which actually relates to texture. It's quite possible that even peanut butter has a well-specified granular size. I can't quote you the exact micron-dimensions, but it's quite likely to be within a typical 'spec' for ground products. After all, all grinding is done by the same processes. This is only an opinion however. I've seen specs for example for solder paste which is very highly controlled. This is an example of 'happenstance' which gives you a product of specific granularity which is useful for polishing. Such coincidences are the boom of DIY processes. Very clever in fact, so don't dismiss out of hand!
Look up 'Jerri Elsworth' on YouTube, she is one my my favorite DIY'ers (featured in 'MAKE Magazine', a source of DIY projects, for those who like to discover 'how things work'.)
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