I Tested Celtic Sea Salt vs Diamond Crystal in My Sourdough: Taste Test Results

For years, I grabbed whatever salt was closest on my pantry shelf when baking sourdough. Diamond Crystal kosher salt was my default — it was cheap, familiar, and always available. But after a few months of reading about Celtic sea salt sourdough bread, I started wondering if my salt choice was quietly holding back my loaves. Could something as simple as switching salt actually change the flavor of my crumb?

The question nagged at me. I had baked probably 200 sourdoughs at that point. My hydration was dialed in. My starter was strong. My shaping had improved dramatically. Yet every time I bit into a slice, something felt slightly flat — not bad, just not as complex as the loaves I’d tasted at good bakeries. I kept circling back to the same question: was it the salt?

The Salt That Actually Changed My Crumb Flavor

After 200 loaves of Diamond Crystal on autopilot, I needed to know if switching to Celtic sea salt would actually shift the flavor profile of my sourdough. The mineral content and crystal structure are fundamentally different, and I wanted to test whether that difference mattered in real bread.

What works

• The fine grind dissolves evenly into your dough during mixing — no undissolved salt crystals creating pockets of oversalted crumb like I sometimes got with larger kosher salt flakes.
• Noticeably deeper, more complex flavor in the finished loaf — the iodine-free mineral profile brings out subtle tangy notes in the crumb that felt muted with my old salt.
• The resealable bag keeps the salt from clumping in humid kitchen conditions, which matters if you’re baking year-round in variable humidity.

What doesn’t

• It costs noticeably more per pound than Diamond Crystal, so if you’re baking multiple loaves weekly, your salt budget will climb.
• The mineral content means you can’t swap it 1:1 with kosher salt by volume — you’ll want to weigh it (2% of flour weight is my benchmark) to avoid over-salting your dough.

I second-guessed myself halfway through my first batch because the dough felt slightly different during lamination — less slippery, which made me worry I’d messed up the hydration — but the finished loaf proved the texture change was just the salt doing its job. Celtic Sea Salt Fine Ground – Unrefined Mineral Salt, Sustainably Harvested, GMP Certified, Lab Tested – Baking, Cooking, Hydration, Everyday Use – 1 lb Resealable Bag

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.