Is blood red or blue?

Since we were on the topic of colors, someone on Friday wanted to know why our veins were blue...I wasn't sure if it was due to "exposure of air" (someone overheard in conversations) since the internet was down, but due to further investigation at http://www.globalclassroom.org/blublud.html,

"Blood is *never* blue. Blood is described as dark red (venous) or bright red (arterial). Our veins look blue because we are looking at them *through* our skin. The blood inside them is dark red and it doesn't reflect light very well."

Thank you, internet! Wow, when there is no electricity, you realize how much you depend it!