Thank you. that's a great explainationIn my judgement it is residual penciling, likely the outcome of a cross of a buff Brahma male (buff columbian) over a dark Brahma female (silver penciled). Could probably get similar results with a partridge male over a columbian female, buff or light.
A single laced feather has a solid base color with a black edge lace,in the case of gold laced.
A double laced feather also has a dark outer lacing.
A penciled, (partridge or dark) has a lighter outer edge.
These are all examples of hen feathers.