I've been trying to create some moulded pralines and have been tempering chocolate using the microwave method. The microwave method was to heat the chocolate in the microwave in small bursts until there are about 30% callets left. Once there are 30% left, you stir until they are all completely melted.
I did this, and tested it on some baking paper and the test set before 3 mins. The test ended up perfectly tempered and didn't turn white over time.
However my moulded chocolates turned out like this: 
This looks different to a lot of the images im finding about bloom. What's happening here?
Best Answer
My best guess is that the chocolate was too hot. It may have worked on your test because it was small and thin, and therefore cooled quickly. In the larger molds, it stayed too warm and you got the wrong kind of crystals from the cocoa butter.
You want the keep the chocolate as close to 88 °F (~ 32 °C) as you can get. What I typically do is microwave 3/4 of the chocolate at 50% power until it's pretty much melted (just a few stubborn bits remaining), then add the other 1/4 of the chocolate and stir to melt. Sometimes it has to go back in the microwave to completely melt the last 1/4, but only about 5 seconds at a time. Very short bursts.