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Sonoran: What exactly is the difference between "isabel" and "isabel porcelain"? Genetically, I mean?
Didn't mean to hijack - OP, your grandmother's hen is gorgeous!
Oh dear. Isabel is lavender diluted buff--the predominant colour in the hen pictured, as well as the colour of my avatar. Isabel is a very "soft" colour, whereas buff is very "bright." Pastel vs vibrant. Generally, porcelain is lavender diluted mille fleur; however, in the silkie world porcelain is a bird displaying both lavender and isabel without the actual mille fleur pattern. Kind of like silver penciled and silver laced are the same colours, but not the same pattern.
Some porcelain silkies are mostly lavender with some isabel; have near equal amounts of each colour and some are mostly isabel with some lavender. I am torn between which term to use because porcelain silkies lack the mille fleur patterning, but the mixed lavender and isabel colouring is stunning in a silkie; for that matter, so is the isabel colouring. We need a working standard.