Threw an unknown vintage 6"worm the other day on a Dropshot. Out of the water the worm looked like a motoroil color.Put it in the water and it changed to Chartreuse...

Based on the description of the colors in an out of the water, what would the actual color of this worm be? Anyone ever seen a color change so drastically from being out of water vs in the water.

IMO you just defined what the Motoroil color is.  Sort of a brownish, golden, amber color out of the water and a chartreuse green type color when in.

Ok so its designed to change colors like that? Pretty neat...

that is neat. I have never thrown the motor oil color before

Lure colors change in the water too the blues look Brown in the water under certain conditions.

Motor oil has been working on the Potomac for me over the past three or more decades because of it's color abilities.

In the 70's several worm colors were on the market called color plus, meaning they changed colors in the water. Light brown that looked purple, light motor oil (green-amber) looked green-chartreuse, dark motor oil (darker green-amber) looked green-red.

Regardless of color changes to the human eye, bass see color differently and one more reason to experiment until tr bass decide it's something that want to eat.

Tom

In the 70's several worm colors were on the market called color plus, meaning they changed colors in the water. Light brown that looked purple, light motor oil (green-amber) looked green-chartreuse, dark motor oil (darker green-amber) looked green-red.

Regardless of color changes to the human eye, bass see color differently and one more reason to experiment until tr bass decide it's something that want to eat.

Tom

Tom nailed it.  Also, the amount and angle of light, and light penetration, all play a part along with the style of presentation.  At one time there was a seven inch curly-tail ribbed motor-oil worm that the bass just would not let go of; I can't find that worm any longer, but I still look for it.

YUM used to make a color called motoroil neon that was my absolute favorite in their woolly bug. It looks motoroil out of water then changes to sort of chartreuse under water and the fish killed it. Now their Cajun Neon does a pretty similar thing. 

7 " motor oil Berkley Powerbait worms are the ticket around these parts!