Well, vintage Marvel comics usually showcase older characters and story arcs that have become iconic over time. The paper quality and color printing can differ from modern comics. Also, they might have value as collector's items due to their rarity and historical significance.
It's not always straightforward to determine if the signed vintage Marvel comic is real. You need to consider things like the reputation of the seller, the consistency of the signature, and any accompanying documentation or certificates of authenticity.
The rarity and condition of a vintage Marvel comic can greatly increase its value. Also, if it's a key issue or features popular characters, that can drive up the price.
Antman shrinks in comics thanks to the Pym Particles. These particles interact with his suit's technology to alter his size. It's a complex process but crucial to his superhero powers.
Well, a really cool Antman fanfic could be one that imagines Antman in a time - travel scenario. He could go back in time to meet the original inventors of the Pym particles and learn the real origin of his powers. Another interesting concept could be a fanfic where Antman has to fight against a villain who has also mastered size - changing technology but uses it for evil. And 'Antman's Rescue Mission' could be a fanfic where he has to save a group of scientists trapped in a microscopic world.