I'm curious what the dose was. When I was taking a fair amount of LSD in the early 70s you could split an orange barrel of Owsley's finest four ways and you'd all be tripping for 10-12 hours on about 250 micrograms each.

My cousin in Scotland who used to deal said that the blotter acid that they made in the 90s was about 50 micrograms a pane as the younger kids didn't like the higher dosages and that you had to take about 5 of them to get the same effect as the stuff that we took in the early 70s.

Are you familiar with the book, 'Storming Heaven: LSD and the American Dream' by Jay Stevens? It's well worth reading if you enjoyed your acid experiences and want to put them into the whole cultural milieu of that drug experience.