Why does my sodium acetate look like metalic magma?

I tried to make sodium acetate.

Ingredients:

• Store bought vinegar - 8% acetic acid, water, E150C (caramel)
• Baking soda - $\ce{NaHCO_3}$

Steps:

1. I first emptied sacks of baking soda to a container
2. I kept adding vinegar until the resulting fuming was mild
3. I started heating the solution slowly, I kept adding more vinegar as long as I could see bubbly reaction
4. I increased heat until all water evaporated. I was left with white-brown chunks of (presumably) sodium acetate and the impurities from vinegar
5. I kept heating this until it melted into opaque black liquid
6. I poured the hot molten stuff into ceramic bowl

This is my result:

I might upload better picture tomorrow, when there's more light available.

So, this does not really look as sodium acetate at all. It looks like a volcano. Clearly there's more volcano-ish experiments with vinegar than I thought.

How do I purify this? Is there even any sodium acetate? Could I burn (decompose) it or something?

• You don't want to purify this. – Ivan Neretin Apr 10 '18 at 22:40
• Could you elaborate? – Tomáš Zato - Reinstate Monica Apr 10 '18 at 22:50
• And maybe remove this picture, my poor eyes! ;) – Mithoron Apr 10 '18 at 23:26
• Question isn't bad, but you had pretty much no idea what happened. TL:DR You used vinegar like it was chemical grade not food grade. Caramel made your product a black unholy abomination of science ;) – Mithoron Apr 11 '18 at 0:28
• Yeah, I had no idea, that's why I asked question, hoping to figure out what went wrong exactly. But yeah I understand now - it's not the first downvote I got for having absolutely no clue about the topic I'm asking about. – Tomáš Zato - Reinstate Monica Apr 11 '18 at 0:53