It's not the mineral mix you want, but the vitamin premix.
Shipping costs would be atrocious from Canada to India.

I woudnt have cared much if it helped my horses. Mostly we are paying double for most imported items (shipping is always as much as the product).
Are you keeping the egg yolk sealed and refrigerated?
Actually, the egg yolk is doing two things. It is a food, and it is an emulsifier of the liquid enrichment ingredients.
Brine shrimp are known as filter feeders. However, they DO NOT take in fluids other than what is soaked into or is coating food particles that they ingest. They DO NOT pass water through their systems like say a clam does to remove nutrients.
Instead, they capture food particles with their appendages and pass the particles to the mouth for digestion.
By emulsifying liquid nutrients/vitamins/medications, you make particles that can be captured and ingested by the brine shrimp.
While commercial products like selco and selcon use special chemicals for doing this emulsion, DIY forms many times use the egg yolk only.
I have had differing experiences than Dan has with particle sizes in that I've found they will not hesitate to capture and eat particle sizes in the 30 to 40 micron range.
The Artemia Reference Centre at the University of Ghent says only that particle sizes should be not greater than 50 but preferably less.
have you tried w/o vitamin mix??
or can the alternatives like multivitamin tablet or Kent marine Vit C type can work?
also what is the function of beta carotene?
Now I understood the work of yolk.
Egg yolk was not stored. I broke an egg and fed it fresh only.