It is yellow in color, usually clear, has a specific gravity ranging from 1.001 to 1.035 and a pH of 4.6 to 8.0. It doesn’t look (or smell) like anything special (most of the time), but it has the power to give us great insight. This yellow fluid cannot lie. Granted, its vessel can damn sure play some games, even buying fake fluid on the Internet in an attempt to mask other deceptions. However, this yellow fluid is what it is and it is what they have ingested, smoked, snorted and ultimately metabolized.