One of the key functional materials of concentrating solar thermal (CST) technologies are the solar reflectors. State-of-the-art solar reflectors consist of a silvered 4-mm low-iron glass protected by a copper layer and 2 or 3 protective paint layers. The protective paint base layer usually contains up to 10 wt.% lead as corrosion inhibitor. However, lead pigments are toxic and carcinogenic and they are likely to be banned in the EU in the near future. For those reasons, lead needs to be removed from solar mirrors and alternative corrosion inhibitors need to be found to protect the metallic silver layer during its expected lifetime of more than 25 years in harsh desert environment. This work presents the results of characterising solar reflector with lead-free protective paint after accelerated ageing tests. According to the first results, the lead-free mirror samples showed promising results.