I just came back from Brasilia 2017. It was a very long way to there with 55 kilograms of exhibits. The exhibition was a very good one with 2800 frames. Many collections from different categories included disinfected mail. Some items were real gems. My collection of disinfected mail did well being award Gold.
Our subject it is very interesting for the public. The organizers asked me to explain to young students about the topic. I did it five times.
I was offer two envelopes from the end of 17th century sent from the King of Portugal to Brasília. both has what was described as chisel slits. I think that this letters where not disinfected. The dealer refused to let me make photos.
Now I am back to the desk to make changes for the next exhibit, Jerusalem 2018.