Hi,

Im trying to create a particle trail that fade off at one end, along with the colour also changing. I im trying to use $AGE or $LIFE with a color pop but even when the alpha is set to 0 the channel still shows white. If someone know how to achieve this please let me know.

Thanks

don't use just $AGE in your lookup, because it will repeat itself
$AGE is in seconds
so it grows 0-1 over one second and therefore your ramp is applied over one second
then as your age grows over 1-2 interval, your ramp will repeat itself
so use clamp($AGE, 0, 1) to avoid repeating
but if you want your gradient to be applied over different interval like 0-2 then you can use fit() expression
fit($AGE, 0, 2, 0, 1)
to fit age 0-2 into 0-1 interval and therefore whole ramp will be used
fit() expression automatically clamps to out range so no additional clamp is needed

but I would do this in SOPs since age is still present there and you can tweak it even after the simulation is done
here is an example how

PS: don't use life variance in source POP for this, because your trail will do weird things when suddenly some middle particles die
PS2: you don't need delete SOP to delete particle system since you have ticked Delete Geometry But Keep The Points in Add SOP so it is already deleted

Wondering on the Colour ramp why is it when you move point 3 towards the end of the ramp, point 4 is always more dominant ? Meaning it doesnt seem to shorten the end colour.

Thanks