Magnesium Oil

Dec 2019
Preston, Victoria
If i was to make up 10 LTS of Magnesium oil using 10 LTS of Distilled water, how much Magnesium Chloride flakes should i use to get around 90 - 95 % concentrate. Also should anything else be added to improve shelf life, or topical applications. Any info, advise or suggestions are very appreciated

Many Thanks
Sep 2018
What do you mean by 90 - 95 % concentrate?
Do you mean 90 - 95 % of the maximum that can possibly be dissolved?
Wikipedeia gives the solubility of Magnesium Chloride as:
52.9 g/100 mL (0 °C)
54.3 g/100 mL (20 °C)
72.6 g/100 mL (100 °C)
Note that Magnesium Chloride comes in two forms:
95.211 g/mol (anhydrous)
203.31 g/mol (hexahydrate)
(Hexahydrate means that 6 water molecules are included in the crystal structure along side each Magnesium Chloride Molecule)
Check which form your flakes are.
Working out the concentration of the resultant solution will be easier with the anhydrous form.
Wikipedia gives the solubility of the hexahydrate form as:
235 g/100 mL (20 °C)
But you would have to work out how much of that is water, from the hexahydrate, and how much is Magnesium Chloride.