How do u know the expiration dats for cosmetics products?????

Because i dont know how long those products have been in the store and sometimes you buy them and it gives you allergiesHow do u know the expiration dats for cosmetics products?????
there's something with the barcode? it's not easy but somebody may know more specifically....it's like month and year for the last numbers????How do u know the expiration dats for cosmetics products?????
generally discard products if they r opened after 12mths.
Look on the crimp.
If you wear contact lenses, it is especially important to be careful how long you use your eye-area makeup. I wear contacts and have sensitive eyes to boot. I found the follow information especially helpful. I have pasted the a portion of the article and source below:





Cosmetics aren't required by law to have expiration dates, so you can't just look at the label to know when a product has expired. Experts vary in their guidelines, but all agree that mascara lasts the shortest amount of time and is the likeliest to cause infections, such as pink eye. Expiration dates are simply ';rules of thumb'; and a product's safety may expire long before the expiration date if a product hasn't been stored properly.





Cosmetics:





Liquid Foundation, 3-6 months (Cream foundation can last 4-6 months)





Foundation in a bottle should last 3-6 months, but wide mouthed jars can expose the product to more air and should be tossed sooner. You'll know it's time to purchase a new bottle, when the ingredients begin to settle or separate, the texture thickens or thins, or the smell changes.





Concealer, 6-8 months





Powders, 1 year





Pressed powder, eye-shadows, blush





Mascara, 3 months





You should never keep mascara for any longer than 3 months (air pushes bacteria back into the tube). Never ';pump'; your mascara.





Lip gloss %26amp; Lipstick, 1 year





Eye/Lip Pencils, 1 year





Eye and lip pencils should last 1 year or more, but you should sharpen pencils at least once a week to prevent bacteria from being transferred to your eye area. You'll know the product has gone bad if it dries or crumbles.





Skincare





Facial Cleansers %26amp; Moisturizers, 6 months





Facial Toners, 1 year





Natural Cosmetics, 6 months (';all-natural body washes';, etc.)





Among other cosmetics that are likely to have an unusually short shelf life are ';all natural'; products that contain plant-derived ingredients (which are conducive to bacterial growth), or products with no preservatives.





Brushes And Tools





Oils and bacteria get trapped in the bristles of the brushes. Wash natural-bristled brushes once a month, and synthetic brushes three to four times a month. Lay the brushes flat to dry so that the bristles don't break, and to maintain the shape of the brushes. There are brush cleansers out there, but you can also use mild soap. You may also use baby shampoo to wash your brushes.





Cosmetic makeup sponges are disposable tools. Wash after every use. Toss within 1 month, or when the sponge begins to tear.





For more information, visit Dayle Haddon's site at dayle.com.





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I am not sure if they actually date the package. I believe, it is more so the date after the product is opened. Mascara is 3 months, powder is 12, base is 6, and I believe eyeshadow is 12 months also. I am pretty sure, anyway. So, this would be months of use after the package is opened. Eyeliner I am not sure - I want to say 12-24? SOmewhere in there. It is suggested that you dip in rubbing alcohol weekly to kill bacteria.

Ltd