What makes this coin dark? How can it be an more dark/secure than Ethereum if you have it on Ethereum? 
We're not trying to be more "dark" than Ethereum. Dark ripple makes use of Ethereum decentralized chain, we focus more on everyday people and micro payments such as P2P payments, and merchant integration. And with Ethereum chain it also allows us to make use of their smart contract feature. To make it more safe and transparent. Think of it as your decentralized option from Ripple 