Thankyou, it did help. I can find out if the lacewing dad carried cobalt or not. Then if so, it is mauve? Should I still pair it with blue?Its a grey with no dark factor. Best pairing would be to a normal blue or violet as this should theoretically give you 50%.
Budgies carry two colour factors although they may only display a dominant gene like green if they are green split blue.
Green is dominant to blue. So greenxgreen = green, green x blue = green
Green and grey are co-dominant to eachother, but both dominant over blue so:
Green x grey = grey/green coloured bird (both colours display and mix)
Grey x blue = Single factor grey bird, split for blue (appears grey)
Your grey is a single factor grey split for blue (grey x blue). If you want to make more greys, you should theoretically get 50% grey chicks by pairing your grey x blue to a blue x blue bird. The best pairing would be grey x grey (double factor grey) bred to a grey x grey. But that is all you will get from that pairing. A grey x grey bred to a blue x blue will give you all visual greys (blue x grey).
Hope that makes sense! Basically, breed it to any blue and you can get some grey's in the nest!
P.S Yes he could be a mauve if the lacewing parent is masking cobalt (or grey x blue with a dark factor). Without knowing what the lacewing is masking it's hard to say.