Rick,
The chemistry teacher made the sulphur acid solution for me. She used concentrated sulphur acid and distilled water. I did it in the chemistry room next to the classroom at school. Some students came to take a look at the process from time to to time with the permission of the teacher. It became an educational project as well. The solution was as strong as the sulphur acid in a car battery. It was 20 or 25%.
And yes, even after washing and oiling that lovely stink of the sulphur came into your nose. I just left the blade (it was a worthless one after all) a few weeks in the garage. Now it is in a box on the attic in the garage. Didn't look at it for ages.
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