After searching, I found some relevant results about Lush bath bombs. Here is the information you requested:

Ingredients or materials:

Lush bath bombs are made with simple ingredients such as baking soda and fruit sugar (sodium bicarbonate and citric acid) that create a fizz in the water. Other ingredients may include synthetic fluorphlogopite, perfume, rose absolute, jasmine absolute, ylang-ylang oil, and vanilla.

Positive aspects:

Lush bath bombs are known for their colorful and fragrant experience. They are also vegan and cruelty-free, which means they are not tested on animals.

Negative aspects:

I did not find any negative aspects of Lush bath bombs in the search results.

In summary, Lush bath bombs are made with simple ingredients that create a colorful and fragrant experience. They are vegan and cruelty-free, which is a positive aspect. However, I could not find any negative aspects of these products.