We were asked how to lighten fabrics.
We would not advise any of our customers to do this themselves as the results are unpredictable.
Essentially though to lighten a fabric you have to bleach it. Some yarns and some dyes can be significantly affected by bleach others very little. Sunlight too has a bleaching effect and its effect depends on the degree of colour fastness of the fabric.
KOTHEA sells a hydorgen peroxide bleached linen. We have already made a few posts about that <here>. this bleaching is the most environemtnally way of bleaching fabrics during production. This bleaching is used mostly to remove the natural colour from linen.