Looking for change color of particules over life

[chefild]

Hi.

I followed the tutorial "CREATING A CUSTOM DYNAMIC STROKE FOR SUBSTANCE PAINTER".
https://academy.substance3d.com/courses/Creating-a-custom-Dynamic-Stroke-for-Substance-Painter

This graph work well with brushes but not with Particules. it remains on the same index.

I wonder if we can replace "stampIndex" by another parameter used by particules like "lifeTime", "time" or "stamp".