We were working on acid-base titrations using phenolphthalein indicator, which goes from colorless to pink when the reaction is complete. I worried that he would have trouble, but he got one of the highest scores in the class on that project! The only hazard I can really see is warning signs, which are often color-coded depending on the hazard. They are also written out in text, however, so you just need to be aware. Of course differences can also occur from different materials (metals), nickel oxide does not have the same appearance as iron oxide etc.
By color do you mean the color coding used in many printed periodic tables? The actual color of the elements is more complex as it depends on the molecular state of the elements a vivid example being carbon. Graphite is jet black and diamond is colorless yet both are elemental carbon. That doesn’t mean we know everything about the atom but what we do know has been has been very useful in the study of chemistry. To use a modern analogy; you can put some red paint on a Volkswagen beetle but you won’t trick anyone into thinking its a Ferrari.
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