Alcohol based neutral adhesives may exhibit this phenomenon, which is caused by the production of titanium chromium compounds as raw materials.
The titanium chromium complex itself is red, and the porcelain white color of the adhesive is the titanium dioxide powder in the adhesive that plays a color matching role.
But glue is an organic substance, and most organic chemical reactions are Reversible reaction, as well as side reactions.
Temperature is precisely the key to causing these reactions. As the temperature increases, a positive reaction occurs, causing a change in color. However, when the temperature stabilizes, the reaction proceeds in the opposite direction, restoring its original appearance.
Having a good grasp of production technology and formula should prevent this phenomenon from occurring.