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I have a Magento site.  In order to reduce duplicate content for products of the same style but with different colours I have combined them on to 1 product page. I would like to allow the pictures to be dynamic, i.e. allow a user to search for a colour and all the products that offer that colour appear in the results, but I dont want the default product image shown but the product image for that colour applying to the query. Therefore to do this I have to append a query string to the end of the URL to produce this result: www.website.com/category/product-name.html?=red My question is, will the query variations then be picked up as duplicate content: www.website.com/category/product-name.html www.website.com/category/product-name.html?=red www.website.com/category/product-name.html?=yellow Google suggest it has contingencies in its algorithm and I will not be penalised: http://googlewebmastercentral.blogspot.co.uk/2007/09/google-duplicate-content-caused-by-url.html But other sources suggest this is not accurate.  Note the article was written in 2007.