Grapes - The Last Chapter

Last summer, the jardin grapevine provided leaves for stuffing, sour grapes for pickling and delicious ripe grapes for juicing (Read full grapevine adventures HERE).

What was left of them, I put in a jar.

You see, I have vague memories of family members throwing all left over grapes in big glass jars and one way or another they turned into vinegar.

At least that is the idea. 

Few months later, I attempted vinegar production.

I squeezed all the juice out and ended up with this murky material. 

It looks beautiful and theoretically this is vinegar, but I am petrified to try it.

Any advice on next steps to make my own home made vinegar?