GC74W5B ▼
Size:  (micro)
Colourless or "shades of grey"
In the cache Color-blind I checked your colour perception. If you could solve it you know that you can distinguish Red, Green, Blue and yellow. If you have problems with your colour perception this cache is made for you. Welcome to Colourless or the mystery of the shades of grey.
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You'll collect a digital Treasure from one of these collections when you find and log this geocache: