Thank you everyone! I think next time I go shopping I'll pick up the 5% and ... It won't hurt 'em if I just take it plain outta the container and apply it on and under their feathers? 
 
 
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Not saying wrong or right but just sharting what we've been doing with the Silkies since we started with them 3 years ago.  Because most chickens are susceptible to respirator/lung issues we chose not to use dusts or powders around our chickens.  We have a Leghorn that sneezes so much just when she takes her dirt baths that we didn't want to add more dust to their health maintenance.  This means we don't use DE, Sevin, pyrethrin (spelling??), cornstarch, etc. 
What we have successfully used for the entire flock (Silkies and LF alike) is Poultry Protector.  It is OMRI organic and I feel 100% comfortable using it over the commercial poisons or dusts.  Poultry Protector is a liquid in a spray bottle and is at our feed store, can be used directly on the chickens or the coop (directions on label) and we don't have to worry about dust kicking up in the coop or when the chickens shake or flap their wings.  I know it works well as we've been lice/mite/scaly leg free for 3 years.  We were shipped two juvenile birds from a breeder and they were crawling with feather lice.  Poor things.  We used Poultry Protector on the young birds and they cleared up overnight.  Just to be sure we applied again on the second night feeling comfortable that it wasn't a harmful poison.  Easy to use, organic, and it WORKS.
A Silkie layed a softshell egg that broke in the nestbox and was crawling with ants.  I sprayed with Poultry Protector and it immediately immobilized the ants so they weren't crawling up my arm as I cleaned out the nestbox straw.  The stuff isn't cheap but we chose it because it was organic the same way we use organic fertilizers and NEEM oil pesticide/miticide/fungicide in the veggie garden to keep it free of strong poisons.  We treat the birds and coop once a month with Poultry Protector.