By far the best was a piece of char cloth. It took less than three seconds to get an ember once the lense was focused correctly.
I tried Tinder Quick and it did not work at all.
Colour is important with a lens. If the char cloth was black, it will have adsorbed more of the light energy, which is part of why it will have been successful. White cloth reflects light. Similarly if you are using newspaper - the black print will work better than the white page.
Tinder Quick is light-coloured, and I think it can also be hard to focus on. However, in my experience it works fine with sparks.
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