How long do black widow spiderlings stay whiteish in color? How long is it until they first molt?

I found and caught a mature black widow in our small back yard area a few weeks back, later killed it. Since then, I've found others around as well. I've sprayed (though I think I need to get something more potent to get rid of them). I've been checking diligently around when outside and watering.... show more I found and caught a mature black widow in our small back yard area a few weeks back, later killed it. Since then, I've found others around as well. I've sprayed (though I think I need to get something more potent to get rid of them). I've been checking diligently around when outside and watering. Though I haven't noticed any egg sacs, tonight I found a white black widow spiderling crawling around.
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