Unfortunately, at this moment, Bruce Wayne could only make out that they were a string of Arabic numerals in the dim light. He had none of Batman's professional night-vision equipment or the eyesight of a nocturnal animal to see what the numbers actually were.
Besides, there were around twenty test tubes in the box, and each one probably had a ten-digit serial number. Bruce Wayne could not memorize two hundred randomly ordered digits in such a short time.
It sounded ridiculous, but in truth, most ordinary people could not do it. This Batman, who was also an ordinary person, could not either.
In fact, memorizing them would not have done him much good. Observation and memory complemented each other. The point of an ordinary Batman remembering those numbers was that he could use his astonishing powers of observation to spot the differences in each vial, then identify patterns by recalling their different serial numbers. From the differing numbers and the different forms of the liquids, he could infer the process used to manufacture them and the purpose of the experiment.
But this Bruce Wayne could not see any difference between the medicines in the box. Nor did he possess any knowledge of chemistry or toxicology. His understanding of chemical experiments stopped at a middle school laboratory; anything more advanced was beyond him.
So, like an ordinary person, when he saw someone with a large quantity of chemicals, all he could think was whether they intended to poison the water. He could get no further information from it.
As for the poisoners' clothing and appearance, any villain with half a brain would not have the people carrying out the poisoning on site wear lab uniforms or clothing with obvious markings. And this Bruce had no ability to identify which laboratory they