A Shiny / Matte LoRA slider. Recommended weights are -2.0 to 2.0 for extremes, but -1.0 to 1.0 is more realistic. As usual with sliders, no keyword. You can focus the effect on a specific object by specifying if the object should be shiny or not. To achieve this easily you need to shift the slider where z-image usually struggles. In the case of the two rubber ducks, specifying shiny / matte does not give good results as they usually are rather matte, so with the slider set to 1 for shininess and keywords for each duck you can have a shiny one and a matte one.

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