Ok so when i color some bitcoin, the amount of bitcoin colored is not relevant, right ?
To go back to the applecoin :
If i create 100 applecoin for my apple growing company, can i just color 100 satoshi to trade?
What is the difference if i color 100 bitcoin?
Am i missing something?
The amount of bitcoins underlying each colored coin is irrelevant from the financial perspective--it is only relevant from the technical perspective because without a small amount of bitcoins the miners wouldn't register your trades and the accounting system wouldn't work.
I am not sure how much bitcoin you actually need to make it work, but I assume it is larger than the dust limit but still quite small. I would like more clarification here too.
And since the bitcoins that are colored are still "real" bitcoins, when you redeem your colored coins, you should get back an equal amount of uncolored coins + whatever was promised. So the value of a colored coin is:
Value of colored coin = value of IOU + value of underlying BTC