Syen takes another sip, trying not to grimace at the chalky grit near the bottom of the cup. Safe is nutritious, but it`s not a drink anyone enjoys. It`s made from a plant milk that changes color in the presence of any contaminant, even spit. It`s served to guests and at meetings because, well, it`s safe. A polite gesture that says: I`m not poisoning you. At least, not right now.