@SuperJohn (View Post)

 An easy way is to make filter of.desired colour using temp tools and then pass a bray through it and let the bray touch a detc which is placed in contact with another filter.This way the filter creatred is permanent and doesn't change its colour.

Check out my save it uses the same principle

To show how to do it i will make a demo save when i have some time.

Here's a save for this hope it helps

I once thought temperature was the only way to change a filter's color as well.  When I found out that there are other ways, it made making "filter" saves a lot easier for me.