When It Goes Pink or Smells Wrong
This lesson covers what to do when your jar scares you — and at some point it will. Every single person who's ever kept a starter alive has had a day where they lifted the lid, looked in, and thought "oh no." That includes me. Especially me: my first starter ever went pink around day five and I about cried. So let's get ahead of it, sorting the smells that are fine from the ones that aren't.
Smells that are fine
Your starter is going to smell like things. That's expected — it's alive and doing chemistry in a jar on your counter. Here's what's normal:
- Tangy, like yogurt or vinegar. That's the acid building up. Good sign.
- Beer-ish, or like bread dough. Also good. That's yeast activity.
- Nail polish remover, sharp and a little unpleasant. This one throws people. It's called the acetone smell, and it usually shows up when the starter's hungry — meaning you waited too long between feedings. It's not dangerous. Feed it now and it'll bounce back in a feeding or two.
- Faintly like a gym sock, mild version. Some starters go through a rough patch in the first two weeks where they smell a little off in a "hm, that's weird" way, not a "get it away from me" way. That's usually just the wild yeast and bacteria sorting out who's in charge. It settles down.
In short, anything sour, yeasty, or sharp is your starter working. Trust your nose more than the internet's descriptions, because every starter smells a little different depending on your flour, your water, and honestly your kitchen.
Smells that are not fine
- Rotten, like actual garbage or death. Not subtle. You'll know.
- Anything that smells like nail polish AND looks slimy, or has liquid pooling with a gray or dark tint. A little clear or grayish liquid on top is hooch — normal, and just means it's hungry; pour it off or stir it in, your call. But if that liquid looks colored, or the whole thing looks slick and stringy, that's different.
What pink, orange, or fuzzy means
This is the one that scares people most, and it should. If you see any of these:
- Pink or orange streaks or spots, anywhere in the jar
- Fuzzy mold, any color, on the surface
- Black or green spots
Throw the whole thing out. Not "scoop around it." Not "just stir it in, it's probably fine." The whole jar goes into the trash, wash the jar with hot soapy water, and start over.
That's a hard thing to hear after you've been feeding something for a week or two and started to feel attached to it. I get attached to mine too — we named ours the Sponge because Richard wouldn't stop calling it that. But pink specifically is a type of bacteria that has no business in your food, and it's not worth the gamble to find out how sick it'll make you.
Here's the full story, because I lived it. My first starter ever went pink around day five. I'd been so careful — weighed everything, fed it on schedule — and there it was, a rosy little streak along the side of the jar. I about cried; it felt like I'd killed something, which I guess I had. But I looked it up, confirmed what I was seeing, and pitched the whole batch. On the second try I kept the jar in the oven with the light on for a little extra warmth and consistency, and that one took. The relief when it finally started doubling was real. So don't take a pink starter as a sign you're bad at this. Take it as a sign to wash the jar and go again.
Why it happens
Usually it's one of a few things: the jar wasn't clean enough to start; the kitchen ran too warm or too humid and something else got a foothold before your yeast could establish itself; or you went too long between feedings and let something opportunistic move in. It's less about you doing something wrong than about a numbers game in the first couple weeks — wild yeast and bacteria duking it out for territory, and sometimes the wrong team wins early.
A caution while we're here
If you're ever unsure whether to toss it, toss it. I'd genuinely rather you waste two cups of flour and start over than eat something that made you sick to prove a point. This isn't the place to be a hero.
My actual opinion on all this
One opinion: discard gets thrown away too fast once people are past this stage — pancakes, crackers, whatever, use it up instead of pitching it. But a starter that's gone bad isn't discard, it's contamination, and that's the one time I'll tell you not to get creative and not to try to save it. Entirely different situation.
Before next time
Check your jar today. If it smells sharp and tangy and looks bubbly, you're fine — keep going. If you see any pink, orange, or fuzz, dump it, wash the jar with hot water, and we'll start a fresh one together next lesson.