Beer darkened during fermentation ?

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Lapja

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the beers in the picture are from the same wort. Now let me explain the series of accidents that led to this situation:

My boiler died at 40 minutes after boil. I figured that I could still save the match and went on with cooling as usual. I split it in two vessels because I wanted to experiment a small batch with lactobacillus acidophilus tablets.

First issue was that I had not hopped at all the wort so I boiled rapidly for like 10 minutes an ounce of Citra and threw it in the big batch. The small batch stayed unhopped because I had read that lactobacillus is very sensitive to hops.

I pitched like 10 tablets of lactobacillus acidophilus in the small batch left it at 45 C and waited for 24h nothing happened Ph was around 5. Hmm... I waited another 24h still nothing.

So I just pitched a Belgian sour mix and lowered the temperature at 34C. There the fermentation started furiously. I had to leave for 4 days and when I returned the fermentation had finished but the beer has gone completely dark. Is the batch spoiled ?

IMG_0287.jpg
 
I'm clueless why it turned dark like that. But it's one nicely shaped bottle!

4 days is a bit short to evaluate. Maybe give it a few more days, then taste it?
 
I'd say Ph is now near 3.2 but gravity is yet 1.032 (OG was 1055). I will give it a week and see where it goes. I am a bit worried because it is unhopped. Should I just pitch some boiled hops?

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