Lower winter temperatures enhance the colour intensity.
Bloom, Adrian Winter Garden Glory (1993)
Defatting and concentration improved its antiaging activity and lowered the colour intensity.
Tinotenda Shoko, Vinesh J. Maharaj, Dashnie Naidoo, Malefa Tselanyane, Rudzani Nthambeleni, Eric Khorombi, Zeno Apostolides 2018, 'Anti-aging potential of extracts from Sclerocarya birrea (A. Rich.) Hochst and its chemical profiling by UPLC-Q-TOF-MS', BMC Complementary and Alternative Medicine
This is basically opaque coloured glass that has the colour intensity and riddled-with-bubbles rawness of hard candy.
Times, Sunday Times (2008)