Five Star Gift Ideas

That's great, here are a few gift ideas catering to his interest in cosmetic chemistry:

1. A DIY cosmetic chemistry kit - There are many kits online that allow you to make your own beauty and skincare products at home, using natural ingredients. Your grandpa would enjoy experimenting with different formulas and creating his own unique products.

2. Subscription to a cosmetic chemistry magazine - There are many magazines that specialize in cosmetic chemistry and offer articles and research on the science of beauty products. This would be an interesting and educational read for your grandpa.

3. A book on cosmetic chemistry - You can look for a book that delves deeper into the process of creating beauty products and the science behind it. This would be a great way for your grandpa to expand his knowledge on the topic.

4. A professional cosmetic chemistry course - If your grandpa is really passionate about cosmetic chemistry and wants to take his interest to the next level, you can consider gifting him a professional course in cosmetic chemistry. This would be a great way for him to learn new skills, while pursuing his passion.

Or you can get him a star map with an important date you share.