Dilute with silicone oil.
Dilution method: assuming that the concentration to be diluted is X ppm, Y g is required, and the high concentration platinum water we used is 9000ppm and Z g.
The formula is: X * Y= 9000ppm * Z.
Example: 100g 2000ppm platinum water is required. Then the grams of 9000ppm are Z = XY / 9000 = 22.2g, and the silicone oil we need to add is (100-22.2 = 77.8) g