Hi Tea
I recall us discussing this topic some time ago. I have made a number of batches of ash brie since then (bought the ash from NECM) and it is to die for. I find it hard to go back to plain brie now!!
This is my procedure, but who knows if it is correct or not. In any case, the result is great.
Make the brie up to and including the brining step (I actually have some in the brine as I type!). I then let the cheese dry a little, but retain a little dampness so that the ash will adhere. I then roll the edges in the ash which is leveled on a flat plate. I then dip one flat surface into the ash, turn up the unashed side and sprinkle it with a shaker filled with ash.
They are then placed to ripen as a normal brie, but I have found that they ripen a little quicker (perhaps 3-4 days) than the normal white mould brie. The mould will start to grow through the ash after a few days, and from then on it's easy peasy.
Make sure you turn them regularly, because if you don't, the mould surface will attach itself to the plastic draining mat.
You WILL enjoy them!
Here are a couple of pics of my first batch..
B