switch between two brushes - each brush with different color

Hi,

I'm new to Fresco and I try to find the best way to creat a setup with this App on ym iPad for my sketching lessons.

So in my training I use two different brushes, one pen in black and one marker in grey.

I have to switch between all the time and I found it difficult to change the brush and then change the color as well.

How. can I have the marker starting with a given grey and the marker with a given black.

Thanks dor your support!