What this cover lacks in flash, it more than makes up for in pure substance. (retrovolve.com)
A lesson covering pure substances and formulations for the new GCSE AQA Trilogy and Chemistry specification. (tes.com)
Sophorose as a pure substance currently has a market value of around EUR 2500 per gram — by way of comparison, one gram of gold costs around EUR 40. (sciencedaily.com)