Subject: ultra violet rays and blue glass

I am planning to build a greenhouse and I would like some information 
on the percentage of ultra violet light that passes through blue glass 
as I understand that clear glass stops 95% of uv rays.  I am 
interested in blue glass, because the information that I have from a 
civil war general on greenhousing and color therapy, suggests that 
blue glass has a curative effect on sick plants and animals.  
References by Ken Kern (Independent Homesteader) who has built many 
greenhouses in the southwest mentions blue glass as a positive factor 
in greenhouses.  Why?

What are the effects of ultra violet rays on plants and viruses and 
bacteria in a green house, both pro and con.  


Thank you.

Re: ultra violet rays and blue glass