I can’t really argue with that. But it also makes it viscous. Didn't catch that when I was cutting and pasting. Good observation.
I actually have a very traumatic experience with a similar situation. A guy was patching cracks in his driveway by heating up tar in a 5 gallon bucket using a brush burner.
Some water had gotten into the tar and it exploded all over him. The burning tar burned his clothes off. His sister tried to cover him with a polyester blanket. It caught on fire as well. It was a horrible sight. On the way to the hospital in the back of the ambulance... he kept asking if he was going to die. And we kept assuring him that he would be alright, but everyone knew that he didn't have a chance. He survived a couple of days in the hospital.
I usually see “viscous” when someone meant “vicious.” And autocorrect is no help on that one.
Molten tar is bad stuff. I used to work with a guy that had a tattoo nipple. He’d been burned on the chest with tar. I heard from a guy whose uncle had gotten badly burned by tar. He said they just pumped him full of morphine and turned on the radio at the hospital.
My high school chemistry teacher demonstrated why you never heat a test tube from the bottom. It made an impression. A friend works with a lot of heliax in his radio business. Copper tubes separated by plastic. We had occasion to burn some, to salvage some copper. Point the ends in a safe direction, and throw it in a fire. If it built up a charge of molten plastic, it would spit it quite a ways, and it would stick and continue to burn. Nasty stuff.