If these are all the same age, then you are slightly mistaken. I will type my thoughts in RED below near each photo. The Standard of Perfection refers to the lavender color officially as Self Blue, though many use the term, officially the correct term is Self Blue. Some of your photos are of Blue and Splash.
You can breed the Splash to either a Blue or Black and get more Blues. Check this link out to learn about breeding Blues.
You can mate the Self Blue to a Black. First generation will be all Black, but Split to the lavender gene.
Did you get all of these from the same breeder? If they were from my farm, I would eb able to identify most of their breedings. The Blacks are more difficult. Blacks will hatch from a Black to Black breeding; a Blue breeding and from a Self Blue to Black breeding. You need to contact your breeder and ask what breeding pens the Blacks came from. They may be pure Black (from either Black or Blue lines) or Split to the lavender gene.
Sorry if this is confusing.
This above is a Blue pullet.
Another that I dont know if she is my Lav or Lav/black... i think its a she LOL
This below is a Splash cockerel.
This above is a Splash cockerel.
My black pullet
This below is a Black pullet.
This Below is a Self Blue cockerel.
You can breed the Splash to either a Blue or Black and get more Blues. Check this link out to learn about breeding Blues.
You can mate the Self Blue to a Black. First generation will be all Black, but Split to the lavender gene.
Did you get all of these from the same breeder? If they were from my farm, I would eb able to identify most of their breedings. The Blacks are more difficult. Blacks will hatch from a Black to Black breeding; a Blue breeding and from a Self Blue to Black breeding. You need to contact your breeder and ask what breeding pens the Blacks came from. They may be pure Black (from either Black or Blue lines) or Split to the lavender gene.
Sorry if this is confusing.
My Buffs
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This Buff is a pullet.
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This Buff is a pullet.
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This Buff is a pullet.
I dont know if this is my Lav or my lav/black gal
This is a Blue pullet. Not a Self Blue.


This above is a Blue pullet.
Another that I dont know if she is my Lav or Lav/black... i think its a she LOL
This below is a Splash cockerel.


This above is a Splash cockerel.
My black pullet
This below is a Black pullet.


This Below is a Self Blue cockerel.
Oh and my Lav pullet
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