The colour change is just different types of grease - nothing to worry about. The place where the grease emerges is below the bearing that is installed beneath the main spring to make the steering a bit lighter and is perfectly normal.

Wipe the excess off carefully to avoid contaminating the brake disk. If you stop just as the grease starts to emerge next time, you will reduce the amount of effort required for the clean up.

To the bottom right of your second picture, you will see a smaller spring. This is the rebound spring. If you look at the RichardV6 picture, you will see a black plastic sleeve which covers the rebound spring and prevents a build up of road grit sticking to the grease. That cover makes King Pins & bushes last an order of magnitude longer. You can make one out of almost anything flexible. Mine are Mohair supplied by DaveW. Richard's look like they were supplied by Wolf Performance (& require a dismantling to fit).

Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross