You will need to have completed the loop, or part of it, and have collected the information to solve this bonus!
To find this cache, you will need to know to work out the following puzzle, using the information obtained from the other caches.
N52 [PURPLE][RED].[GREEN][PINK-GREEN][ORANGE] W0 [YELLOW-PURPLE][GREEN.[BLUE][BLUE][PINK-PINK]
Rainbow Caching is a series of 26 caches all based around the colours of the rainbow, or near enough, set for the Rainbow Caching weekend camping event (. It is a loop of just under 5 miles and should take you less than 3 hours to complete. The loop is mostly on quiet roads, frequented by cyclists, or over bridalways, footpaths and through a woodland. No animals were encountered on the loop, but there is potential to pass cows between 6 and 8 (I passed 4 on the other side of the field).
Most of the caches are 50ml tubes, or 5ml tubes. 21 of the caches will have a coloured 5ml tube inside with a number on it, and you will need the numbers to be able to find the bonus! Each colour is featured 3 times, so don't worry of you miss one, you'll come across it again soon. The numbers are written on the coloured cache (containing the log) and also inside the lid.
I hope you enjoy this loop and have as much fun finding the caches as I have had setting it!