Can I use hot water for skim milk powder? I was trying to make milk tea from skim milk powder and black tea bags today, and found that after adding hot water to skim milk powder, that powder doesn't fully dissolve in the water. There are lots of white tiny particles in the hot water that doesn't disappear after 20 minutes.

I checked the instructions and it said use cold water to mix the powder. Are the white particles I saw normal? Or are they only a result of me incorrectly using hot water?

Thanks.
I always use hot water and it has worked fine. In fact i find milk powder dissolves quickly in hot water than cold.