Hi,

When i first played the game many years ago, the Quen sign was blue during the entire game, upgraded or not. I'm currently rediscovering the game in a 2nd playthrough, and the color of Quen switched to red from blue. I was wandering if it was now a visual enhancement for higher Quen intensity?

It has nothing to do with the sign intensity. It has everything to do with obtaining the Summer's Crown ability.

that's right baby, fire fire fire! basically hit me and burn little ugly monsters..