Lightfastness

[@chrishayes4195]

I understand that Faber Castell bases their star system on the Blue Wool Scale so it's possible to determine how many stars I'm willing to require. As far as the Stabilo Carbothellos, Do you have any idea what each star actually means? How do you determine how many stars is your minimum?

[@Lindamoirart]

Hi Chris. It is my understanding that they all use the Blue Wool Scale test. The Stabilos are rated on a scale out of five so, personally if fading is a concern, I would be sticking with the four to five star rated pencils as my minimum. Hope this helps.