I am not sure bout acid free in relation to toners. I do know that my information on the clear sticker sheets is that they are acid free, coming from the company that makes them. A laser printing like a photocopier basically heat seals the toner and therefore it doesn't smudge. I had to buy a little black laser printer cost app $170 to print name meaning certificates people were buying from me as the inkjet printer ink was smudging no matter what setting it was on, and I couldn't sell them with smudgy ink. The coloured ones are way dearer.
Don't get me wrong I do take the whole acid free thing seriously, but I also think it is very hard to be 100% sure that what these companies are telling us about acid free and lignin free is true. My other issue with the whole acid free thing is that I like to put memorabilia and other items such as certificates and stuff onto my pages and they are def not acid free. eg things like leaves or feathers, the kids bracelets from hospital, I have put coins of the birth year on a page, Josh's kinder graduation certificate, party invitations. I guess my theory on it is I use acid free stuff where possible and if I am unsure about something I will still use it but not have it touching the photos themselves.
What does everyone else do?