I was first introduced to Dykem (blue) as a kid in my dad's machine shop in the 1950's. It's easier for me to see scribed lines with these old eyes with the red. Also the smell of Dykem brings back fond memories.

Used to dye blade of a display sword.Works perfectly.

Just what I was looking for

I have seen this used (usually blue) in many metal working videos for years. Decided to try it for myself. So glad I did. It makes layouts on metal so much easier and more visible. If you brush it on lightly, it will be dry almost as soon as you put the lid back on the can. I wont be without it as long as I work with metal.

Ive been using Dykem for the last 5 years or so its is the best thing for making anything. I use it all the time for making phone chargers and things like that. Just dab a bit on blow it dry and let it sit for a few minutes and it lasts for years never wears off like sharpie does. Its essentially sharpie in a bottle but be careful because once its on something its most likely not coming off. Will come off things like hard plastics and metal with acetone.