https://japanesetaste.com/blogs/japanese-taste-blog/shiro-dashi-a-complete-guide This article says shiro dashi lasts about 2-4 weeks in the refrigerator. It is probably more of a taste and quality deadline than a safety issue.
this post was submitted on 05 Apr 2025
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Is there no expiration date on it? That stuffs like 75% salt so it probably lasts a really long time like a year or more ๐คทโโ๏ธ
Edit: here's what a reverse image search came up with
Shelf Life: Once opened, it should be refrigerated. While the exact shelf life isn't specified on the bottle, soy-sauce-based products with high salt content can last a long time, potentially several months, if properly stored.