Hey everyone, Food & Beverage Processing
Let’s cut to the chase—when you pick up a bag of strawberries, a jar of orange juice, or a bag of potato chips, the first thing that grabs your eye? The color. It’s not just a pretty face, either. Color tells you if that strawberry is ripe (or overripe), if the juice is fresh, if the chips are the crispy kind you crave. But here’s the thing: none of that perfect, consistent color just happens on its own. It’s all about food and beverage processing—and as someone who’s spent 12 years in the F&B processing supplier game, I’ve seen firsthand how every step of processing can tweak, twist, or even totally transform that color you’re staring at. Today, I’m breaking down the real science behind it, no stuffy textbook jargon, just what I’ve learned from working with breweries, snack brands, and juice makers every single day.
First off, let’s start with the basics: why does food have color in the first place? That’s all to do with pigments, right? The main ones you’ll hear about in this space are carotenoids, chlorophyll, anthocyanins, and maybe a few others like betalains. Each pigment is built to soak up certain light wavelengths and bounce back the ones we see as color. Chlorophyll is why spinach is green, carotenoids turn carrots orange and mangoes that sunny yellow, anthocyanins give blueberries that deep purple and cranberries their bright red, and betalains are that weird bright pink in beets. But here’s the catch: these pigments are fragile. Processing them—whether that’s heating, mashing, grinding, freezing, even how you store them—can mess with their structure faster than you can say “rotten banana.”
Let’s start with heat processing, because that’s the big one for so many products. Think of canning tomatoes, pasteurizing orange juice, baking bread, or even toasting coffee. Heat is a workhorse in F&B, but it’s also a pigment assassin if you’re not careful. Take chlorophyll, for example. If you’ve ever wilted spinach in a pan and watched it go from vibrant emerald to that drab, olive green sludge, you know exactly what I’m talking about. What happens there? Chlorophyll has a magnesium atom right in its center, and when you heat it up in an acidic environment (like the water spinach cooks in), that magnesium gets swapped out for hydrogen. The result? That yucky pheophytin pigment we all hate. I once had a client making frozen spinach packets who was losing 18% of their color pre-heat because they were cooking it at too high a temp for too long. We adjusted the blanching time to 90 seconds at 185°F instead of 2 minutes at 212°F, and boom—they cut their color loss in half, and their product stayed that bright green customers paid for.
Now, what about carotenoids? They’re a bit tougher than chlorophyll, but heat still messes with them. Take orange juice, for example. When you squeeze fresh OJ, it’s that bright, zesty orange, but if you pasteurize it the old-school way—super hot, hold for a minute—you’ll notice it fades to a dull, pale orange within a few weeks. Why? Carotenoids break down when exposed to high heat and oxygen, right? That’s called thermal degradation, and it’s a huge pain for juice makers. Another example: when you roast sweet potatoes or make sweet potato fries. The longer you roast ’em, the darker they get, right? That’s not just carotenoids breaking down—wait, no, actually when they get that deep orange or even a little brown, that’s a Maillard reaction happening too, and wait let’s not jump ahead. For carotenoids specifically, when you process tomatoes into paste, actually, the heat can make some carotenoids more available, but wait, let’s clarify that. For raw tomatoes, lycopene (the red carotenoid) is locked up in cell walls. When you heat process them into paste, it breaks down those walls, so lycopene is more visible—so tomato paste is way deeper red than a fresh tomato. That’s a win, but only if you don’t overdo the heat. I had a tomato paste client once that was over-cooking their pulp, so their lycopene was actually breaking down into smaller molecules that were lighter red, not darker. They adjusted the hold time, and their paste went from a pinkish mess to that rich, deep red that brands want.
Next up, enzymatic browning. This is the one we all know from cutting an apple and watching it turn brown 5 minutes later. Enzymes (called polyphenol oxidases, or PPO for short) that were locked up in cells when the fruit or veg is whole get exposed when you process it—like cutting, mashing, or bruising. When they mix with oxygen, they make those brown pigments called melanins. This is a huge issue for things like apple juice, banana puree, or even pre-cut fruit salads. If you’ve ever bought a pre-cut mango and it’s gone brown before you get home, that’s enzymatic browning. How do we fix that? We use things like ascorbic acid (vitamin C) or citric acid, which bind to the oxygen before the PPO can get to it. I worked with a pre-cut fruit brand last year that was having a problem with their apple slices turning brown on store shelves. They were dipping them in a citric acid solution, but we adjusted the concentration from 0.5% to 1.2%, and added a tiny bit of calcium to keep the cell walls strong, and they went from having 30% of slices browning within 2 days to less than 5%—no more waste, and customers got that bright, fresh apple color.
Oh, and Maillard browning—this is the fun kind, the one that gives crusty bread its golden brown, coffee its deep roast color, and roasted chicken that crispy skin. It’s a reaction between amino acids and reducing sugars when you apply heat, and it’s different from the browning from enzymatic reactions. This is actually a good thing most of the time, right? No one wants pale bread or bland coffee. But you have to control it. For snack brands making potato chips, for example, the frying temperature is everything. If you fry potatoes too hot, the Maillard reaction happens too fast on the outside before the inside is cooked, so you get burnt, dark chips that taste bitter. If you fry them too cool, they’re pale and soggy. I had a potato chip client a while back that was getting a lot of complaints about inconsistent color—some chips were super dark, some almost white. We tested their fryer temps and found they were running at 375°F for thin-cut chips, but some fryer baskets were running at 395°F. They adjusted each fryer’s temp to 365°F for thin cuts and 370°F for thick cuts, and their color consistency went through the roof. No more returns, no more wasted batches.
Wait, let’s talk about processing methods beyond heat. What about freezing? A lot of people think freezing stops color change, but it doesn’t. When you freeze food, ice crystals form in the cells, right? Those sharp little crystals can poke and break the cell walls, which lets pigments and enzymes leak out. So if you freeze strawberries too fast, small ice crystals, less damage, but if you freeze them slow, big ice crystals, mushier texture, and more pigment leaks. I worked with a frozen berry supplier once that was having an issue with their frozen raspberries looking dull and faded when they thawed. They were using a blast freezer that was too slow, so ice crystals were huge, breaking the cells. We suggested switching to a liquid nitrogen freezer that freezes berries in 2 minutes instead of 15, so ice crystals are tiny, cells stay intact, and their raspberries stay that bright red even after being frozen for 6 months. They sold out within months of switching—customers noticed the difference immediately.
Then there’s storage, which is kind of part of processing, right? What you do after processing affects color too. Light, oxygen, and even pH can mess with pigments. Let’s take beer, for example. When you bottle beer, if you use clear glass, the light (especially UV light) can react with hops in the beer, making a skunky smell and turning the beer that weird greenish color. That’s called “light strike.” Brewers fix that by using amber or brown glass, which blocks UV light. I worked with a craft brewery in Portland a few years back that was getting a bunch of returns because their IPAs were turning green on store shelves. They were using clear glass because they thought it looked “crafty,” but we suggested switching to amber bottles for their IPAs, and their return rate dropped to zero. Another example: pH levels. Anthocyanins (the red/purple/blue pigments) are super sensitive to pH. Blueberries are blue at a neutral pH, but if you mix them into a muffin batter that’s super acidic (like with buttermilk), they turn bright red. That’s why some blueberry muffins have pink spots—because the pH in the batter changed the pigment. I had a bakery client that was making blueberry muffins that had inconsistent color, some pink, some blue. We adjusted their batter pH by adding a tiny bit of baking soda to lower the acidity, and their muffins stayed that deep, dark blue they wanted.
Wait, let’s get real for a second. A lot of brands think that to get perfect color, they just need to add artificial colors. But that’s not always necessary, and more importantly, customers these days want natural colors, right? They don’t want to see “Red 40” on the ingredient list. That’s where processing techniques come in—if you know how to work with the natural pigments, you don’t need artificial colors. For example, beets give a bright pink color (betalains), turmeric gives yellow, spirulina gives green. But even those natural pigments are fragile. I worked with a soda brand that wanted to make a natural pink lemonade without any artificial colors. They were using beet juice, but it was fading after a few weeks on shelves. We suggested pasteurizing it at a lower temp (HTST—high temperature short time, not the old LTLT low temp long time) to preserve the beet pigments, and adding a tiny bit of guar gum to keep the pigment suspended so it didn’t settle at the bottom. Their natural pink lemonade was a hit—no artificial colors, consistent color, no fade. That was way better than what they were doing before.
I also want to talk about over-processing, because that’s a huge mistake new brands make. They think more processing = better shelf life, but too much processing can destroy color and even flavor. Take ready-to-drink smoothies, for example. If you blend a smoothie and then pasteurize it super hot for a long time, all the fruit pigments break down, so the smoothie goes from bright green or pink to that dull, brownish sludge. I had a smoothie brand last year that was using a traditional hot-fill pasteurization process, and their smoothies were looking like old juice. We switched them to cold pasteurization using high pressure processing (HPP)—that’s when you put the sealed bottles in a chamber and apply super high pressure to kill bacteria, no heat needed. Their smoothies stayed bright green and pink, just like when you make them fresh. They told me their sales went up 40% in 3 months because customers could taste and see the freshness.
Wait, let’s make sure this is relatable, not just a list of facts. Let’s think about a product you buy every day: cereal. The bright red cherries, the blueberries, the yellow corn flakes. All that color comes from processing. The cherries might be freeze-dried to keep their red color, instead of dehydrated at high heat which would turn them brown. The blueberries might be coated with a tiny bit of sugar after processing to keep the pigment from breaking down. I worked with a cereal brand that was having their cherry pieces turn brown during storage. They were dehydrating the cherries at 160°F for 8 hours, but that was too hot. We lowered the temp to 120°F and extended the time to 12 hours, so the cherries dried slower, the pigment didn’t break down, and they stayed bright red for 6 months on shelves. That simple adjustment saved them from redoing their entire product line.
Now, let’s get to the part that matters for you, whether you’re a brand owner, a procurement manager, someone just starting out in F&B. The key takeaway here is that color isn’t random. Every step of processing—heat, pressure, cutting, freezing, pasteurization, storage—has a direct effect on what your product looks like. The worst mistake brands make is not testing their processing steps early enough. They wait until their product is almost ready to launch, then realize their color is off, and they have to redo batches, waste money, miss deadlines.
As a F&B processing supplier, that’s exactly what I help with. I don’t just sell you equipment or ingredients— I work with you from the very start, when you’re still testing recipes, to figure out how to preserve your natural color, avoid those ugly surprises, keep your product consistent, and even cut down on waste from bad batches. I’ve been in this game long enough to know that a product’s color is half the battle—if it looks good, customers will trust it, buy it, and come back for more.
If you’re dealing with color issues in your processing—your juice is fading, your snacks are inconsistent, your frozen products look dull—hit me up. We can walk through your process, test different methods, and find a solution that works for your product, no jargon, no empty promises.
Food & Beverage Processing References:
- Food Chemistry, 5th Edition, H.D. Belitz, W. Grosch, P. Schieberle, Springer, 2009.
- Enzymatic Browning: Mechanisms and Inhibition, Journal of Agricultural and Food Chemistry, Vol. 59, No. 10, 2011.
- Thermal Degradation of Carotenoids in Food Processing, Critical Reviews in Food Science and Nutrition, Vol. 55, No. 12, 2015.
- High Pressure Processing: Effects on Food Quality, Annual Review of Food Science and Technology, Vol. 1, 2010.
Hangzhou Precision Machinery Co., Ltd.
Hangzhou Precision Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of food & beverage processing machinery in China, also supports custom service. With abundant experience, we warmly welcome you to buy advanced food & beverage processing machinery from our factory.
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