How to create the selective color effect in Premiere Pro:
1. In the Lumetrie Color panel open the 'curves' tab
2. Open the 'Hue Saturation Curves' panel
3. In the 'Hue vs. Sat' panel drag the line all the way to the bottom to desaturate
4. With the eyedropper click on the area you want to bring back
5. From the 3 dots in the color range drag the middle one back up
That's how you bring one selective color back. Premiere Pro will understand that there is a color to be 'sampled' although you just had desaturated it by dragging the line all the way to the bottom.
Very quick and easy way to create the selective color effect in Adobe Premiere Pro