content: Amber liquid color matched what they were dumping. It's also water soluble, thus it mixes with H2O and you couldn't tell the difference. So, assuming water did leak in, it would lighten the color a bit, but still look brownish. It appears this was used for machine parts, assuming they use to cool off machines while making parts, so the mineral oil would have shavings and oil in it probably. This is all just assumptions.