I'd be wary of "home mixing" aye it might be that that was all they've removed, and adding it back in might put it back to what it was. Then again it might also be a case of they've put something else in to replace it which could react badly. Not just in terms of liquid volatility but also the fumes generated...
I'm no chemist, in any case I wouldn't risk it, unless you really know what you're doing.
I'm no chemist, in any case I wouldn't risk it, unless you really know what you're doing.