Thread: Blending powders

The other thread about contaminated powder got me thinking.......

Assuming they are all the same powder.
Lets say you have a part used 500 gram tin of lot # 1
and another 500 gram tin of lot #B
Then you managed to score a 1 KG tin of lot #F

Should you mix them together? Bearing in mind that each lot is already "mixed" to provide a consistant burn rate for us small time users.

Or should you load develop each seperate lot?