OK there seems to be a lot of confusion as to what she's trying to do, some here thinks shes trying to age wood and others think she's trying to remove the natural color. Its my understanding she has very weathered wood and is trying to get some of the natural color back, not age it more and not remover the natural color, but to get back some of the natural color the weather has taken away. If it pine barn board household bleach will do the job, the strength may vary some , you might need a stronger mix then 1/3 2/3 but if its pine it will work. If its some type of hard wood like oak or birch I don't know if it would work or not. Pine is softwood with a porous grain and bleach will lighten it right up. Sorry Matt no pictures as the cabins in NH I'm in AZ and I did it years ago, and I have no weathered pine out here, mesquite I have but its very hard don't think bleach will work on mesquite.