1, clean the soles before drying.
2. Apply paper glue on the edge of the yellowing position: prevent yellowing agent from entering the outside of the sole, so as not to damage the shoes.
3. At this time, the yellowing agent is being prepared.
4. Apply a proper amount of yellowing agent to the place where the sole needs to be yellowed, and then apply it evenly with a brush. It is best to wear gloves when handling, so as to avoid yellowing agent sticking to your fingers and being difficult to remove.
5. Leave the yellowing agent for eight hours.
6. Finally, wait eight hours, brush off the stains and dry them.