![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0OJ6IxVWpqiPwIrUCDP6BqawRj0I4uHnglnOJ7sRsEnkAxBD6KVpBNfYaXTiZyZEbpn_TL_AndT9dM_S1vIF18oQHE_S3Kx3UXHi9SJ0yO4D-bT9lgnBzrRek7ZRBkw7VGyQBl3YEj84/s640/029a.jpg)
The sciencey bit: basically, the active ingredient that makes any self tanner work is dihydroxyacetone or DHA for short. It's essentially a type of sugar and when applied to your skin, reacts with the top layer to brown it in a similar way that food browns when it's left exposed to air. Since it is just the top layer of skin that the DHA reacts with, it lasts for just a couple of days until that layer of skin has been washed away. Gradual tanners have a much lower concentration of this ingredient than regular fake-tan which makes the effect more subtle and allows you to build up the tan gradually.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgO0MQDkfKIQORqa2EKRiLKrt17pBHM4jDa15gdx-TH0ILcqvQunwDeRIRNz5k0q7h1sppjsQprJU0qFZUIjeGGH4dsL2imLVVBJSwy6yqVFkA6gpAupGd9qyc4aAeyPPlBP4_lX2GP8wE/s640/030a.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6_dFe9J5lsA5raqYRzx_lEjgVdCMJzCBL0Ho2Xxq17-FLDgnkheSS_aeFqLW4BwFLZnU1rKsIueAScaFWc-uf83xZ1yhDAHoO8HBioNNZTRuJGp65MRlztAcPRs2QWvRuWyZj4-afHj0/s640/017a.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilyvv1w5RzVJWWYzIol5eoa3_LFUBhiTeapMPsYsi7m-CvS4sD4yW25mS5NXIxrrrNCZFCmXh5s2F_9lwP7j6Crt2BpeD_0JRNp-vWNpCj_8CeUqjjzmkCQKA1RtesxsTl8vsGM2c4l4s/s640/009a.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIwdOu7ph4uB47IObyjWuKHeAkzZ6OhqFF94pfm8BhnnLn1tLdODU-0FxBx-FtFa6KrkQqW7i5ENgvoI3sId1IW1Wh2Anw7oPC-oVKv-kYgUDbZIxquHfvqQRkj-XKh7YZv6YkKqGu8SI/s640/012a.jpg)
The product was sent to me to try but as usual this does not affect my opinion in any way.