These come out and will professionally apply a tint to windows in your home aswell as cars. They have a separte brochure, which I no longer have on house window tinting;
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Alternatively, you could go into a car supplies shop, like Halfords and purchase a DIY car window tinting kit. However, its very hard to get it to look as good as that done professionally. You can get a lot of bubbles in it. But if you have a steady hand it might be the cheaper option.