Black plastic used back in the 70’s?

Drip lines.

Could you explain that?  I’m not a climber.  Thank you.

I’m not a climber. I see those stoves have a history in the climbing community. So maybe not a general backpacking question as I took it. I’ve carried trash bags is about it.

I’ve came across a lot of abandoned irrigation lines in certain areas. Black tubing left over from folks were doing illegal things in the hills.

Supposedly, one of my #9’s was from Larry’s gear, pump, labeled fuel bottle, paint blackened pot.  So had to have been used in the early 70’s, about when I started bping.

The later MSR models had a plastic base on them, if I am remembering correctly.  The plastic was a round disk was under the aluminum burner housing.   I could see how priming the stove could possible melt it.   Do they still have the leather to catch the priming fuel?  Picture?

Thank you for the comment.  I’m talking about the model 9 stove, MSR’s first model.  I have all the early MSR stoves and many after.

I started backpacking in 1976 or so, and the only thing I carried that was black plastic back then was the trash bag I used to line the stuff sack that housed my sleeping bag (which was strapped the the frame below my pack…lol).  I also used plastic cups and bowls, but they were brightly colored (I don’t even think black was an option).  Everything was flammable back then, so if the plastic actually caught on fire, it might have turned black; that would have required a level of stupidity that I wouldn’t expect from a MSR stove owner back then.
Is the plastic melted to the stove or just stuck to it?  Maybe it was stored in a plastic bag that deteriorated and stuck to the stove.

Thank you for the comment.  Plastic on two was either stuck to the sides or the bottom.  Forgot about maybe the stove was put away while still hot, resulting in the plastic melting and sticking to the stove.