What indicates that residual latex might still be present in the extracted aloe vera gel?

Answer

A bitter taste

The yellow latex, which contains aloin, has a distinctively bitter flavor profile. If the gel tastes bitter after being rinsed or prepared, it is a clear indicator that latex residue is still present. When this occurs, it is necessary to rinse the gel cubes thoroughly again to ensure the substance is safe and pleasant to use, as the presence of this bitterness is directly linked to the chemical compounds that cause digestive or skin irritation.

What indicates that residual latex might still be present in the extracted aloe vera gel?
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