A new blackboard painting

I started a new painting in the past few days.
I've applied a few layers of black gesso to the already triple primed canvas.
Then I started drawing and doodling with white ink and chalk.
To make the painting last longer, I experimented and found a permanent white marker that is creamy and is applied and looks just like chalk.
It has the added benefit of being permanent, it does not smear or rub off.
In fact it is very lasting, but it looks just like white chalk does on the canvas.