Match more than the shade name
Check the product range, shade name and number, finish and size. A foundation shade can vary between formulas within the same brand, and a lipstick colour name may return in a different finish. Do not assume a new package contains the same product without checking the listing and manufacturer information.
Use a photograph of your existing label or a written note when shopping. Screen colours and edited swatches are not reliable evidence of an exact match. If trying a different product, use a suitable tester or the brand's comparison guidance where available, while recognising that a suggested match is not a guarantee.
Limit the backup quantity
Estimate how long your current product lasts and count unopened spares. A three-for-two offer can be useful for a regularly finished item, but less so for a colour worn only at occasional events. A cheaper unit price does not recover the cost of products you do not get around to using.
Read the product's storage and use information, including any applicable period-after-opening marking. Keep backups sealed until needed rather than opening every one to compare the colour. Buy from a seller that provides clear product information and supplies intact packaging.
Check the return conditions before opening or trying a cosmetic. If a favourite shade is being discontinued, a modest spare may be reasonable, but buying a large reserve does not solve the eventual need to find an alternative. Compare the total spend with your rate of use and keep the shade record current. The useful saving is on the product you intended to replace, not a collection of nearly right colours selected because they were reduced.
