The kheer can take on a mild pinkish hue. This is because pressure cookers cause the sugars in the ingredients to caramelize, making the milk take on a light brownish-pink hue. If you've made dulce de leche in your pressure cooker, you'll relate to this. This is what is called the 'Maillard reaction' and is consistent with pressure cooking. I for one, love caramelized flavors, and I am partial to the slightly pinkish-brown color rendered by the caramelization in the Instant Pot. The taste of this kheer and its consistency is spot-on!