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If you’ve ever noticed that bread bags at the grocery store have different colored twist ties, it turns out there’s a reason—and it has to do with how fresh the bread is.

According to several reports, the bread loaves have twist ties and plastic tags to indicate when the loaf was baked.

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In fact, there is an entire color code, Reader’s Digest informed of.

According to the website, each color represents a different day when the bread was baked: blue tags indicate that the bread was baked on Monday, green tags indicate Tuesday, red tags indicate Thursday, White tags indicate Friday and yellow tags indicate Saturday.

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Reader’s Digest reports that most commercial bakeries are closed on Sundays and Wednesdays, which is why there are no specific colors on those days.

According to insiderThe reason bakeries color-code their twist ties and tags is to help employees find stale loaves and replace them with fresh loaves.

For this reason, it’s unlikely you’ll ever see more than two colors on shelves, according to Reader’s Digest.

While the system is not necessarily universal—some local bakeries may have their own systems—it is “widely used in commercial bread bakeries across the country,” Reader’s Digest reported.