Prepare both types of chocolate one after the other. If you only like one variety, then take the 100 ml of oil at a time. With 2 different types each 50 ml.
Coarsely grind the chocolate and melt it over a medium heat over a water bath. Then remove the saucepan from the heat and stir in the oil thoroughly with a whisk until it is no longer visible. Then pour through a sieve, collect in a bowl, then pour into the siphon, screw it on tightly, attach the star nozzle and screw on an oxygen capsule. Until the hissing stops. Shake the bottle very vigorously. Then unscrew the capsule and use a second one as before. Shake vigorously here too.
Then hold the bottle vertically and squirt the chocolate into the bowl with a short distance. This until nothing comes out and it no longer hisses. Then immediately (without shaking it as much as possible) put the bowl in the refrigerator. It takes approx. 1 - 2 hours to harden. Then do the same with the second portion.
If you have a larger siphon with twice the capacity than 250 ml and only want to make one type, the entire mass can be put in at once. But then you have to screw on 4 capsules one after the other and shake vigorously each time.
The above quantity of ingredients refers to 2 bars of 300 g each.