How do black, red and yellow iron additions compare in a glaze?

Example of 5% black iron oxide (left), red iron oxide (center) and yellow iron oxide (right) added to G1214W glaze, sieved to 100 mesh and fired to cone 8. The black is slightly darker, the yellow has no color? Do you know why?

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Recipes	G1214W - Cone 6 Transparent Base A cone 6 base clear glaze recipe developed by deriving a recipe from a formula taken as an average of limit formulas
Materials	Iron Oxide Red Red iron oxide is the most common colorant used in ceramic bodies and glazes. As a powder, it is available in red, yellow, black and other colors.
Materials	Iron Oxide Black
Oxides	Fe2O3 - Iron Oxide, Ferric Oxide

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