Negative re targeting is related to frequency capping, but slightly more finessed. Basically it means not showing the user an ad for something that they have already purchased.So It’s like Why invest advertising budget into an ad for something the user has already purchased – disrespecting the user and running up the advertising bill at the same time?
Still, negative re targeting doesn’t meant that an advertiser has to stop advertising to that “already-purchased” consumer altogether. We need to stop advertising related to the same thing what he has purchased but needs to show him the complimentary thing related to what he bought , example if he has bought CD player he will definitely plan to buy CD’s , similarly if a cricket bat is bought by any user , other cricket accessories may attract him to buy that.. 
How to do negative re-targeting? Are there any tools, free or paid.
Is there any similar feature in Google ads also?
A user who reaches to the conversion page makes any purchase , the unset imprint pixel will remove the specific imprinted user from the pool ,But later on again if the same user comes up to the site will again be naturally imprinted..
So basically the unset pixel works as temporarily pixel to remove the user who has been converted.
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Tim not that exact site i know, keep in touch! Thanks.