Read the statement by Michael Teeuw here.
Two way mirror in United Kingdom
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 Guys I have a question I came cross mirror supplier which offers 
 Standard thickness two way mirror 6mm, and also 4mm
 I have smaller Version of Magic Mirror with 6mm glass.
 But I never come cross 4mm.
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 I am also in the UK and have been searching for a suitable mirror, so far the option for thickness seems to be either 3 or 6mm, made from Acrylic, Polycarbonate or Glass. Reading other posts it is recommended to use a mirror with a 70/30 light transmission, however, I seem to only be able to find UK suppliers who have 50/50. Which spec do you end up getting and are you happy with the results? 
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 Hi 
 I think my glass light transmission will be around 50/50 or 60/50
- My Clock Setup
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 @michael24h So 50/50 or 60/50 is fine, you don’t need 70/30? Where did you get the mirror from? 
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 I get the mirror from Walsh Glazing Half Moon Ln 

