A construction material includes a base material. The base material includes a low-gloss region having a 60 gloss value of smaller than and a high-gloss region having a 60 gloss value of larger than or equal to 8. The 60 gloss value of the low-gloss region and the 60 gloss value of the high-gloss region are different from each other by 5 or greater.

The present disclosure relates to a sensor element for a potentiometric sensor, including a substrate and an ion-selective enamel layer arranged on the substrate. The substrate has at least one region which is electroconductively connected to the ion-selective enamel layer. The region of the substrate, which is electroconductively connected to the sensor layer, is made of a copper-based alloy having a mass fraction of at least 60% of copper.