one thing to consider:

you may get a multi-sire clutch, meaning some of the eggs will be from one dad, some from the other. (the others are correct, super pastel pieds are impossible, one egg has one mother maximum and one father maximum).

so all the normal looking ones will only be possible het pieds, not 100% het pieds. you only know for certain that those that did not get a pastel gene must be het pied. for the pastels, you will not know, and can only advertise and sell them as possible hets. if you get a super pastel, it will be a 50% possible het pied.

multiple possible dads, and sperm retention, can cause people to falsely believe they have a 100% het.