A device composed of a color changing indicator, an optional polymeric binder, preferably having gel forming capability, and an activator solvent system which induces a color change in the indicator when device is frozen, in the region of about 0 to 30 C. The cylindrical bonding structure is formed over the bonding pad of a silicon chip and the chip is flipped over to connect with a substrate board in the process of forming a flip-chip package. The sequence layer may be configured to observe the ART label sequences and incrementally build, update, and trim, and reorganize an ngram trie for those label sequences.