Brushes: BloomHue | Procreate

This brush allows you to achieve multi-color lineart based on the pressure you use. Select your base colour and start drawing while adjusting your pressure. 

Brushes:
✦ BloomHue 1.0: Select your base colour and based on your pressure, it will adjust the hue of that selected colour (blue > purple)
✦ BloomHue 2.0: Select your base colour and based on your pressure, it will adjust the brightness and saturation of that selected colour (pink > dark maroon)