To be clear, the original Grain Rain amino acid facial cleanser turned red, which does not mean that it can no longer be used. The red color may be caused by oxidation of some parts or contact with air. This does not necessarily mean that the quality of the product is problematic or harmful to the skin.
If you are still worried that the use of red cleaning solution may have adverse effects on your skin, it is recommended that you conduct sensitivity test first. You can apply a small amount of cleansing stock solution to sensitive parts such as the inside of your arm or behind your ear, and observe whether there are any uncomfortable reactions such as redness, itching and irritation after 24 hours.
If the sensitivity test results are normal, you can continue to use Grain Rain amino acid cleanser. But please pay attention to the correct method and proper use in the process of use. If you still have questions about product quality, you can also consult a professional doctor or brand customer service for more detailed advice.
Just because Grain Rain Amino Acid Cleanser turns red doesn't necessarily mean it can't be used any more. But for the sake of safety, it is recommended that you conduct sensitivity test first and consult professional doctors or brand customer service for more detailed advice.