Pink ball could be used for all Tests - ICC chief exec David Richardson

A pink ball could be used for Test cricket "all the time", according to International Cricket Council chief executive David Richardson.

The red ball currently used in Tests can be difficult to see under floodlights, such as during the climax to England's draw with Pakistan in the first Test in Abu Dhabi on Saturday.

A pink ball will be used in the first day-night Test, between Australia and New Zealand, in November.