The one I have here is blue and came direct from my 3Ms (Scotch) supplier. It lasts very well - so what appears to be a small amount goes very far. A household trigger spray with water and a few drops of washing up liquid makes a fine lubricant for it. Microporous cloths from the supermarket fine for after claying - but obviously wash frequently.
Trick is to wash the car and run your hand over the paint, then after claying. The difference in 'smoothness' is amazing. And as I said, it doesn't remove any paint. My old car is plain black, and the bar always ends up brown. My newer one is metallic with a clear coat, and the bar ends up brown too.