Variable payload keeps still displayed on the UI even when no there's no payload

[omardmf]

I'm using python to detect two colors "red" and "green", and display them on the node red UI in the form of a text and a led, if i detect green a text green will be written and the led is lit green, but when i terminate the color detection code, the text and led are still green.
i have a function before the text and led to discriminate between red and green:

var Color = msg.payload
if (Color === "Red") {
return msg;
}
else if (Color === "Green") {
return msg;
}

[dynamicdave]

As far as I can see, you are not actually changing the message payload - just returning the original message from each part of the 'if' 'else' construct.

It would help if you posted/shared your Node-RED flow and explained what your main objective is.