You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Type 2 pattern of etched enamel is also known as: and explain in detail?
According to Silverstone et al and Galil Wright 
Type I

Selective removal of enamel prism cores.
Peripheries intact (honeycomb appearance).

Type II 

 Reverse process.
 Peripheries removed.
 Cores intact (cobble stone appearance  with prism edges lost).

Type III is the mixture of pattern I and II.
Type IV – Pitted enamel with map like appearance.
Type V – flat smooth surfaces