The colourproducing reagent is added and the tints compared.
The leaves of both assume rich purple-red tints in autumn.
This beautiful material presents a great diversity of tints, but a rich hyacinth red is common.
Penck on a scale of 1: i,000,000, which has been undertaken by the leading governments of the world, the ground is shown by contours at intervals of ioo metres (to be increased to 200 and Soo metres in mountainous districts); the strata are in graded tints, viz.
The dull green was followed successively by amber, white opal, blue opal, straw opal, sea-green, horn colour and various pale tints of soda-lime glass, ranging from yellow to blue.