Color It is used to be extracted from plant but now it is synthetically produced and It is Halal if synthetically produced from Halal sources. Liquid for requires solvent, liquid for is Halal only if Halal solvent are used.
MailOfIslam.com : Halal if use as is as a 100% synthetic color but if pork glycerin is added as a solvent then it is Haraam
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