Window blinds - colour depends on window open/closed

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SUMMARY

The discussion centers around the color perception of window blinds (NCS S 4010 Y50R) when viewed through a closed triple-glass window. Users noted that the blinds appear light brownish when the window is open but take on a dark greenish hue when closed. This color change is attributed to the iron content in regular glass, which imparts a green tint. Low iron glass, such as Pilkington Optiwhite, is recommended as an alternative to mitigate this effect.

PREREQUISITES
  • Understanding of color theory and color perception
  • Familiarity with NCS color notation
  • Knowledge of glass types and their properties
  • Basic concepts of light transmission and filtering
NEXT STEPS
  • Research the properties of low iron glass, specifically Pilkington Optiwhite
  • Explore the impact of glass composition on color perception
  • Study color theory related to light and materials
  • Investigate alternative window treatments that minimize color distortion
USEFUL FOR

Interior designers, architects, homeowners considering window treatments, and anyone interested in the effects of glass on color perception.

Thunderfox
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Hello,

I am a bit confused regarding something I have observed on the blinds in front of my windows. The "real" colour is a sort of a light brownish colour (NCS S 4010 Y50R to be precise - see http://ncscolour.com/product/s-4010-y50r/).

However, when the window in front of it is closed, the colour you perceive from the inside of the house is a sort of a slightly dark greenish one. On the attached image you can see the blinds with the window-door open (right) and closed (left).

This is a bit confusing, I have no idea why the colour changes. There door is triple-glass.

Any ideas ??

Best regards

Richard
 

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The glass filters some wavelengths more than others.
 
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I believe regular glass contains iron which gives glass a green tint. Sometimes the edges of glass are obviously green. You can get low iron glass of which Optiwhite (Spelling?) Is one brand available in the UK. It's used for things like frameless showers.
 
Thanks for your replies. Regards
 

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