The question of color keys/guides/gauges and which one is the best to use, or where one can be purchased comes up as often as (What Washington is this?) or (What stamp is this?) or (What is this worth?). This one of the most common topics comes up as often as buying eggs or gas/petrol etc... Not only on this forum but several others and strangely enough I responded to a post on Stamporama that has turned out eerily similar to this one.
Unfortunately that answer will never be a straight answer to that question. I too have asked the question which one do I use? The only straight forward conclusion I can come up with is. Get as many as your'e willing to get and you can afford without going bankrupt doing so. Then there is free or almost free. The internet is a great tool and the Stamp Smarter site is by far in my opinion the best. But it is not without limitations as many of us found out recently when part of it when down. Besides the answers are always a mixed bag of opinionated, subjective, responses especially here in the keyboard commando world. Then it becomes questions that one has to ask themselves.
1) What country do I live in? Why is this important many of you may be asking? For example here in the United States the most common guide that most of us to Identify colors, types and catalog # is of course Scott. Harris USBNA, Brookman, and many other philatelic names use Scott as the benchmark to go by.
Then of course there is Stanley Gibbons that is used primarily by the UK and many other places in the world. Lets not forget Michel which is used other countries in the world, I am sure that I am missing some others but the point is there is not one singular answer to the OP's question.
2) How much or are you willing to spend on such scientific devices based upon opinion and conjecture to support the hobby? Only we as individuals can answer that question honestly. I for one will spend as much as my wallet allows me to.
3) Then we are faced with many problems of acquisition of the devices that are many times out of production/print. Such as the Scott Specialized Color Guide for U.S. Stamps. They reality is this will only get you close when you are trying to identify used stamps. I like many others here are fortunate enough to posses one.
If I am correct Scott hasn't printed them in quite sometime. The market supports this. I have seen one listed on
ebay to the tune of $5,000 dollars. That is crazy if you ask me.
So what are we to do? There are as many answers to that question as there are catalogs and color guides. Many of those answers one has to remember when asking are opinions filled with superlative terms like the best.
My opinion is to use more than one source to find your information and keep on collecting. I use the rule of 3 sources if there is something I am trying to identify then taking the closest 2 of the 3 and split the difference.
Then there are those of us who use stamps that are known to be the color issued by the postal services as the base line to ID those hard to ID stamps which works great for unused stamps. But is a different story for used stamps especially those stamps that are over 100 years old. Additionally everyone sees colors differently that my friends is a cold hard fact.
Jeremy