Spectrophotometers Measure Opacity and Color Quality in Beer for Small-Scale Breweries


Posted on September 18, 2017

One of my friends has operated a small-scale brewery for the past five years, and he makes the most delicious lager that I’ve ever tasted. But he wasn’t always this skilled at the craft; when he first got started, he didn’t realize the importance of opacity and color quality in beer. For the first few years, every batch he made looked slightly different—one might be a dark, cloudy brown, while the next looked creamy gold. It was a frustrating experience for him. After investing in quality control tools, and experimenting in his new brew lab, he finally achieved consistency, and as a result, his brewery’s beer tastes and looks better than ever.

If you own a microbrewery or other small-scale business, you can save a great deal of time and wasted beer by measuring the color and opacity of your brews in advance. This method allows you to make changes to your brew long before bottling, creating your own dream beer from scratch.

Quality Control Matters for Small-Scale Breweries

You might think that color quality control only matters for large-scale breweries that produce millions of barrels per year. However, color consistency is important whether you’re brewing 6 million barrels or just 15,000. In fact, color quality control is perhaps more important for small-scale breweries than it is for larger, established brands. As a lesser-known producer, you’re still in the process of building your reputation in the industry. Big-name brands can rely on a loyal customer base every year, but as a smaller producer, you have to actively market your beer to brand new customers. In order to leave a lasting impression these beer drinkers, you have to ensure that your product looks consistent and professional on the shelf, and that your beer is always brewed perfectly. It’s this attention to detail that will earn you a loyal roster of customers.

How to Achieve Consistency

Of course a consistent product looks more appealing, but beyond appearances, consistency is also a sign that you brewed your beer properly. For example, if your first batch is slightly darker in color than your second, it’s likely that your second batch won’t taste as robust or coffee-like as your first batch. By measuring the opacity and color quality in beer, you’re able to pinpoint which stages of the brewing process need improvement using both the beer’s color and taste as a baseline for your data. In order to achieve consistency across batches, you’ll need to measure opacity and color quality in beer during a few key steps in the brewing process.1

First, you can measure the color of the mash as it steeps. If your wort is too dark in color already, this will tell you that you need to decrease the pH level of your water and vice versa if you want to deepen the color. Next, you can measure the color again as your mash steeps, waiting until you achieve the perfect hue before moving on to the next brewing step. Repeat this process for the kettle boil and hopping steps. Finally, measure both the opacity and color of your brew during the fermentation and filtration stages. Generally, your beer will lose some of its color during these stages, so tools that measure color can help you find an ideal (usually darker) pre-filtration color that will eventually lighten into the perfect hue when you reach the bottling stage.

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