A-level Chemistry/OCR (Salters)/Colour by Design

Colour by Design is the eleventh unit in the Salters Advanced Chemistry course.

Realgar is an orange-red mineral used as a pigment in ancient times. Pararealgar is orange-yellow. They have different colours because they have different crystal structures, despite having the same empirical formula, AsS. The crystal structures of realgar and pararealgar contain differently-connected As₄S₄ molecules − these are shown above, realgar to the left, pararealgar to the right.

Chemical Storylines sections

• CD1 Ways of making colour
• CD2 The Monastral Blue story
• CD3 Chrome Yellow
• CD4 Chemistry in the art gallery
• CD5 At the start of the rainbow
• CD6 Chemists design colours
• CD7 Colour for cotton
• CD8 High-tech colour
• CD9 Summary

Chemical Ideas sections

• 6.7 Where does colour come from? (revision)
• 5.1 Ions in solids and solutions (revision)
• 6.8 Ultraviolet and visible spectroscopy
• 13.6 Oils and fats
• 7.3 Chromatography
• 6.1 Light and electrons (revision)
• 12.3 Arenes
• 12.4 Reactions of arenes
• 13.10 Azo compounds
• 6.9 Chemistry of colour

Activities

• CD1 Changing colours chemically
• CD3 Seeing colours
• CD4.1 Using reflectance spectra to identify pigments
• CD4.2 What factors affect the drying potential of an oil?
• CD4.3 Investigating paint media
• CD4.4 Identifying a pigment
• CD4.5 Finding a perfect match
• CD5 Comparing hydrocarbons
• CD6 Making azo dyes
• CD7.1 Dyeing with a direct dye and a reactive dye
• CD7.2 Different dyes for different fibres
• CD9 Check your notes on Colour by Design

External links

• CD unit map
• CD Check Your Notes