Glass Lamp Etching?

I have a pretty Hurricane lamp with the bottom Night Lite glass shade and the top a regular glass shade. The thin line is fading and chipping off a bit and I love this lamp and would like to figure out a way to perhaps remove the pencil painted line (as I probably won't be able to match the color) and reinsert a new line close to the original color. Does someone perhaps know of a way I can preserve my cherished lamp with a near original look? Thanks so much.