Hearing the process was interesting but I was more intrigued by the intensity of the colors all around us. We were expecting the smell and rather enjoyed the fresh mint they gave us at the door to hide the strong odor. As we were being told the details of the process, every once and a while he would repeat, "do not worry, you don't have to buy. You are welcome". I smiled as much as he did every time he said it. When it was time to see the end result of their work (the shop), he would repeat, "do not worry, you don't have to buy. You are welcome". When we finally said that we weren't going to buy, his super friendly demeanor turned to short and abrupt sentences to scoot us out as soon as possible.
Since it was free to tour the facilities and we did not buy anything, it was worth the time and effort to go. Would I recommend going? Yes. I gave a 4 star "very good" rating for this reason. Better than "average" but not "excellent" (I wish there was a "pretty good" rating). As long as you don't buy anything. Just expect, as I am sure you are well aware, the sales pitch to be given to you in the sort of kindness that is an obvious nonchalant reverse psychology. Did I say obvious? Good.