I have to ask? If it's invisible how do we see them?

Meanwhile back at the ranch. Yes, I have three colors and different sizes. I'm sure there are more, since my investigation is limited to my small collection.

Most of the modern chips are greenish. There are yellow and orange (kind of peach). Then there are the three sizes. It appears that the most modern graphic chips have the larger H&C.

Next comes position. My conjecture is that each order is different. From observation, which may be skewed by wishful thinking, I see rotation of the H&C along with position on the chip. This is from multiple chips from the same casino.

Hypothetical analysis. Month and Year. They do appear in the same place on the same chips. It isn't an overstamp that is random. Using the clock for the month, that would provide the position around the outer circle. The rotation, based on ten positions, would be the year.

Too much time? Who me?

I know I took pictures, and that may have been before Gregs BB or in the erly stages. I'll have to search the archives, or start over. I did take notes on the exposure for film (which works much beter), and various digital images. Problem is that digital cameras are much more sensative to the blue and purple range of UV than film. So the images don't turn out as distinctive and have false hues, or color effects.

For anyone just playing, look at Golden Nugget or Caesars Palace for some interesting multiple images. The most well known is $1 Luxor which varies from seven different designs to one sided and no UV markings. I don't know of any that haveunmatched sides, but I've only read what is here and looked at about 50 different chips. They could exist.