Silvering in the Self Campbells
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Silvering Black and Blue Babies
Silvering and Non-silvering blacks and blues
There is variation in the amount of silvering as soon as they first get their color.  Here are some three-week-olds.  The silvering is very apparent on one blue and one black but not apparent on the others.  It is common for the silvering to be whitest on the shoulders as these are.  This variation is even found within litters.  The ones who are already silvering will continue to silver.  The others will indeed start to silver but will silver later in their lives.  It is interesting to note, though, that when they are a year old, there is no longer a correlation between the amount of silvering they then have and the amount they had as youngsters.  Some of the blackest youngsters can be heavily silvered.  Most of those already silvering as youngsters, though, seem to have a significant amount of silvering.
Young Silvering Blue
Heavily Silvered Blue
Here is an example of a blue who has silvered.  He had a touch of silvering on his shoulders as a youngster.  Within five months, he was heavily silvered.  Here is his picture five months after the first.  His father was a heavily silvered black, and his mother was a black with almost no silvering.
The other self colors also silver.  This is a Red-eyed Lilac who is silvering.
Black youngsters
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Silvering RE Lilac