That is the main reason why we called them par blue. Because this mutation is a yellow factor. The original mutation was a hybrid between the black mask and the fischer mask family and maybe something else. Who knows. For that reason, it will take everyone a few years to clean them up. Whether you want them to be more like the blackmask or the fischer mask lovebirds. Whichever eye-ring you like, it will take about 3 years to clean them up. However, making them looking like the blackmask lovebirds will definitely be easier. Because the blackmask eye-ring is more dominate and much easier to find on the market. If you want the par blue to be more like the fischer mask, just make sure you have a lot of nice ones available. Because the fischer mask lovebirds are a lot harder to find on the market.