Hello,

I am in the midst of really diving deep and learning Houdini. My knowledge is at a beginner knowledge level with dynamics and such but I really enjoy effects and want to learn the ins and outs of Houdini.

Currently, I am working on a personal project/R&D with smoke where I need the color of the smoke to start out one color and change to another over its age. I have messed with the default Temp, Heat, Burn, etc. but it does not give the wanted effect. It needs to be a little more linear. So I thought maybe age would do it, but I do not know enough yet to know how to pipe that into the process and be used by the material. What kind of route can I take to do this? Any help or ideas will be very much appreciated, thank you.

First of all I'm not so expert with fluids but I think age attribute has not defined for voxels. Voxels are just simple containers of data. Actually fluids are not particles that exist for some time they are just migration of some data between voxels.
But you can think of some fields with similar result. For example maybe your temperature decrease by time and you can change this field in a vop to become more linear.

Thanks for the reply Mosssi. Yea, I was messing with temperature, but using that I could only get it to gradient from the center out rather than from emission to death/dissipation. I am not sure how to make it more linear, still learning VOP/VEX, but that definitely gives me a direction to look at and something else to google. Thanks!