Blue+Red+Yellow<br/>Red+green / Orange+blue / yellow+purple<br/>blue+brown.<br/><br/>So your possible combinations for this black stuff, is either<span style="color: #0000FF">Saponin Seed Oil</span>+<span style="color: #FF0000">Robos Star Oil</span>+<span style="color: #FFFF00"><span style="font-weight: bold">Scraeder Bile</span></span>(heal skill check),<span style="color: #0000FF">Saponin Seed Oil</span>+<span style="color: #00BF00">Anaxew Salt</span>(heal skill check),<span style="color: #FFBF00">Lilani Juice</span>+<span style="color: #FF0000">Robos Star Oil</span>(heal and time on islands),<span style="color: #FFFF00"><span style="font-weight: bold">Scraeder Bile</span></span>+<span style="color: #8000FF">Aboline</span>. (heal and alchemy)<br/><br/>If the mixture is more complicated, it'll be the Blue + brown one, which means Blue+Orange (heal and time on islands) mix then add Blue (heal) OR Green+Red (heal) then add Red (heal) OR Purple+Yellow (alchemy and heal) then add Yellow (heal).<br/><br/>I suggest just making the first four options in four seperate throwable vials and testing them on enemies to come to a conclusion which to use. So whoever has the highest heal check would be the best choice, maybe under supervision from another character using aid another, if it's out of character to be mixing such things normally.<br/><br/>My guess would be for the fourth, tho, reading the descriptions.