How to determine whether the lip glaze deteriorates?

To determine whether the lip glaze deteriorates, it can be observed from the aspects of appearance, texture, smell and use, as follows:
Appearance aspect
Color change: lip glaze discoloration, such as the color becomes dim, yellow, gray, or uneven color, color spots, etc., like the original bright red lip glaze becomes dark red and has brown spots, which is likely to be metamorphic.
Gloss change: normal lip glaze has a certain gloss, if the gloss is significantly weakened, become matte rough, or there is abnormal oil, the surface has similar “oil spot” phenomenon, may have deteriorated.
Abnormal packaging: Check the packaging of the lip glaze, such as the bottle or tube body expansion, deformation, rupture, or the lid is difficult to tighten, the seal is not strict, may lead to air, water into the lip glaze deterioration.

Textural aspect
Stratified precipitation: the lip glaze is obviously stratified after standing, the texture of the upper and lower layers is different, or there is precipitation, caking phenomenon, such as the upper layer is a thin liquid, the lower layer is a solidified paste, indicating that its texture has changed and may have deteriorated.
Viscosity change: the texture becomes too thin, the fluidity increases significantly, and it is difficult to control when applying; Or become too thick, dry, difficult to squeeze out and spread evenly, are the performance of deterioration.
Foreign bodies: Carefully observe, if there are particles, flocculent, small bubbles and other foreign bodies found in the lip glaze, it is not the texture state that the original product should have, indicating that the lip glaze may have deteriorated.
Odor aspect
Produce odor: normal lip glaze has its own fragrance or no obvious odor, if you smell sour smell, rancid smell, pungent chemical smell and other abnormal odor, and the original smell is significantly different, to a large extent has been deteriorated.
Experience of use
Increased irritation: When using the lips have tingling, itching, burning and other discomfort, or after using the lips appear red, swollen, peeling, rash and other allergies or uncomfortable reactions, and there are no these conditions when previously used, may be caused by lip glaze deterioration.
Abnormal makeup effect: the makeup effect does not last long after application, the makeup is quickly removed, or there are mottling, peeling, card lines and other phenomena, which are greatly different from the makeup effect when the product is normally used, and may also be caused by the deterioration of the lip glaze.