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Scale: Multiplyer for the procedural texture size.
Strength: Controls the scatter of light by the glitter. At a value of 1, the surfaces can be rotated in a 180° dome. At 0, they always point straight out, effectively disabling any glittering.
WARNING:
Due to the noisy nature of glitter, this material does not play well with the denoiser!
Consider increasing the resolution of your render, or disabling the denoiser. If you disble the denoiser you might need to increase the sample count significantly to get rid of noise elsewhere in the image.