Bone China is a mix of cow bone ash...

 Now I know..... a bit more

. . . . .the main difference between bone china and fine china is that bone china mixes cow bone ash into the ceramic material. Now I know you are tired of me saying this but they don’t do this to make the material stronger; they mix cow bone ash to give it a unique colour tone. A bit hard to tell from an image but still you can tell the difference between bone and fine china above. 

Hertford which is bone china has creamy soft white colour compared to Hampshire Gold which is made from the fine china (or sometimes called fine porcelain) without any cow bone ash content. By mixing the bone ash in the ceramic material, it gives your china a warm soft looking colour and translucency. It’s easier to see the difference when you lift up a cup under the light. You will find that bone china is more translucent and will let more light in compared to fine china.

So it all comes down to your preference. If you are like me and prefer creamy white colour in your china, you should definitely choose bone china