Use APKPure App
Get Visible Light Spectrum old version APK for Android
स्पेक्ट्रम में अलग हल्के रंगों के बारे में युवाओं को शिक्षण
This App will be used at the National Science Week where this year's (2015) theme is International Year of Light. Bringing touch and voice to teach youngsters about different light colours in the spectrum and how to develop an app like this.