I was in a similar position as you. It had been a while since I had taken math classes. However I am a computer programmer and I know the mathematics involved with what I do, but it was a limited understanding as far as general mathematics was concerned. I wanted to learn more advanced...
These silver based pens contain mostly acrylic as the base and so you have to shake them really hard to mix-in that tiny trace of silver. I noticed the package your purchased contained something like 6 pens for around $29.99? Kinda fishy, considering that most of these silver pens run around...