Here is my Primary yellow collection.
It's a nice mixture of dishes and shades of Yellow...
401 Mixing / Nesting Bowls
402 Mixing / Nesting Bowls
404 Mixing / Nesting Bowls
One 2 Quart #024 Round Casserole Baking Dish with Lid
Four 501 Refrigerator Dishes aka Fridgies with Lids
Two 502 Refrigerator Dishes aka Fridgies with Lids
I also have a square one that I forgot to add to the hutch before taking photos
Pyrex Profile - Yellow Bakeware (1956); Yellow Bowls (1957)
Pale Yellow Bakeware:
These solid-colored pieces include:
023 & 024 round casseroles,
213 loaf pan,
209 pie plate,
221 cake pan,
222 square pan,
and 231 & 232 rectangular pans.
The 024 casserole remained until early 1963, but the other shapes & sizes disappeared in the late 1950s.
Bright Yellow Bowls:
This shade of yellow is unique
It was available only on 300-series & 400-series nesting bowl sets.
It does not match the yellow 404 of the regular multi-color set.
The all-yellow 300-series set remained until early 1963, but the 400-series set disappeared in the late 1950s.