Looking for suggestions on a good chemical sunblock that completely prevents tanning....?

I want a Sunblock that completely prevents tanning, I ve found out that physical sunblocks make the skin turn a tint of purple (I m indian, with light brown skin) so a chemical sunblock would be great if anyone out there has ever used one, if there is an expert on skincare here on yahoo answers, please can you... show more I want a Sunblock that completely prevents tanning, I ve found out that physical sunblocks make the skin turn a tint of purple (I m indian, with light brown skin) so a chemical sunblock would be great if anyone out there has ever used one, if there is an expert on skincare here on yahoo answers, please can you guide me?
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