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Sulfite Test Strips 100/Vial

Use these test strips to detect sulfite levels from 10 to 500ppm - confirms absence of sulfite in wine, lemon juice, potatoes, shellfish or dried fruit.

Note: Food Warnings that say "May contain sulfite" are referring to trace levels & will likely not register with these strips. If you reduce liquids such as wine or lemon juice by boiling (water evaporation) it may be possible to detect sulfites.

For people with an allergy to sulfite, 100ppm is generally considered to be the minimum to trigger a reaction. Use these strips if you aren't sure about the food source. 

Click on the Details tab below or read more in our blog on what 10ppm really means.

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People using these test strips to check for sulfites in wine should note that most if not all wines sold in North America will come with a warning label "May Contain Sulfites" regardless of whether they do or not. This is done for legal reasons since even the most rigorous cleaning methods cannot prevent tiny amounts, <1ppm, of sulfite being produced from the sulfur found in the proteins of the yeast used in fermentation.

However, various world heath organizations have set 10ppm as the lower limit for people with asthma & other health concerns. If the test strip does not change color, you can assume that the sulfite level is low enough to be considered safe for consumption. Read more in our blog on what the 10ppm level really means.

If you are very sensitive or are simply curious, you can also use these strips on dried fruits where sulfite may be used as a preservative. Simply wet the reaction pad of the test strip with water (distilled or deionized ideally) & press it up against the dried fruit. If sulfite is present in high enough concentration, you should see the pad change color.

For those interested in the chemistry of how these strips work, please refer to this pdf which explains the theory of how sulfite is detected.

Note (1): The number of strips per pack or vial is approximate.

Note (2): Tests for sulfite produced from sodium meta bi-sulfite preservatives;

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