Generally a couple of darker feathers does not a splash make. Chances are if the dark feather is plucked, it will grow back in the proper colour. Splash backgroud colour can vary from white to a medium slate. In either case, dark blue shoulf be "splashed" irregularly throughout the entire plumage. WIth some birds there is considerable contrast; with others it is gentle shadings. I have a youngster now whose colouring is gorgeous. He has a darker background, but his splashes are very dark; a sharp contrast. Gorgeous! I need to figure out hoew to post more photos as my space is all full at the moment, and whenever I've tried using web photo albums of one sort or another, I can never seem to get tehm set correctly to share photos so that others can see them.
Blue can vary from pale blue to almost black. Head and hackles of females are darker; likewise, head, hackles, saddle and tail of males. In a too dark blue, you cannot see the two separate colours in these areas. Some blues are popping up that seem to meet the self-blue standard of uniform colouring throughout the body, but are too dark to be lavender.
Silver has patterned feathers, and usually easily discerned from blue, splash or lavender.