I've given some thought to what color this slightly lubricious material is and I have two options. The first is petri dish pink. The second is hot porno pink. You know I choose the more salacious name for this not occurring in nature color. This is the back end of a Airmar P79 inhull transducer installation repair. The housing apparently is leaking ergo it's my fault since I installed it. The porno pink colored stuff is nontoxic antifreeze, aka propylene glycol.