Have you ever refilled a toner (HP 415A for me), I found a tutorial with the manipulation and it’s ok.

But I’m little bit lost with the powders. Can I use a powder recommanded for Canon in an HP, and if not, can you explain me why.

And do you know if an “HP powder” is it compatible with all HP printers ?

And if you have ever done this, where are you buy yours.

Thanks in advance.