light wood darkened by dark wood

[DennisR]

I glued purple heart with maple and when sanding the maple was being darkened by the purple heart or something. I was not as white when I started. how do I prevent

this when gluing dark and light wood together and sanding?

[Tpt life]

Try a card scraper from light to dark. 

[Coop]

I agree. You're sanding the Purple Heart dust into the maple. Like washing colored clothes with your whites. 

[DennisR]

thanks for quick reply

I tried sanding but will try scraper.

is there a way to prevent this other than sanding before gluing and don't sand after glued together?

[JosephThomas]

1 hour ago, DennisR said:

thanks for quick reply

I tried sanding but will try scraper.

is there a way to prevent this other than sanding before gluing and don't sand after glued together?

You could try doing a seal coat before sanding to fill the grain and pores a little.  You'd have to test this out on some scraps to figure out the right amount of sealing to do. 

[phinds]

9 hours ago, DennisR said:

I glued purple heart with maple and when sanding the maple was being darkened by the purple heart or something. I was not as white when I started. how do I prevent

this when gluing dark and light wood together and sanding?

You think that's bad, try it some time with padauk.

Joseph has the right idea ... use a pore filler before sanding. Also, if try doing all but the last grit or two with a belt sander with the belt moving light to dark and then finish with a high grit on a ROS.