Role of plasticizer

what is the role of plasticizer in tablet coating?

to allow initial film forming and to achieve the right amount of film flexibility to avoid cracking and peel-off. Is there more reason? what’s happen if we use more or less plasticizer?

Plasticizer breaks long chains of polymers and rearrange polymers to enhance its film forming capacity.
plasticizer decrease glass transiton temperature of polymer.

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Is plasticizer help in color distribtion?

opaquants help in color
not plasticizer