It has been suggested by those who breed against the Boston Terrier standard that the disqualified colors were eliminated based upon the opinions of very few people in key positions at the BTCA who simply didn't like those colors. 

Should anyone think the creation and subsequent refinement of the Boston Terrier standard was taken lightly, I invite you to read the comments below by Edward Axtell in his book published in 1910. This book is often referred to by those who breed against standard as proof the colors existed at the beginning of the breed (a fact the BTCA nor educated show breeders deny). However this same book is also proof that the BTCA put careful planning, thought and reasoning into the elimination of those colors and that even in the early years, some of the colors were already considered "undesirable". 

One cannot point to a resource as proof in one breath and then disreapect its ideals in another.  The ENTIRE history of the Boston Terrier should be sufficient to explain the existence AND the elimination of certain traits that did not lend ot the ideal the creators envisioned. 

"The standard adopted by the Boston Terrier Club in 1900 was the result of earnest, sincere, thoughtful deliberations of as conservative and conscientious a body of men as could anywhere gotten together.

Nothing was done in haste, the utmost consideration was given to every detail, and it was thoroughly matured, and practically infallible guide to the general character and type of the breed by men who were genuine lovers of the dog for its own sake, who were perfectly familiar of the breed from the start, and who were cognizant of every point and characteristic which differentiated him from the bulldog on the one side and the bull terrier on the other, and while admitting the just claims of every other breed, believed sincerely that the dog evolved under their fostering care was the peer, if not the superior, of all in the particular sphere for which he was designed, and all-around house dog and companion.

In the writer's estimation this type of dog, for the particular position in life, so to speak, he is to occupy, could not in any way be improved and the mental qualities that accompany the physical characteristics (which are particularly specified in the next chapter) are of such inestimable value that any possible change would be detrimental."

"The Boston Terrier And All About It"    - Edward Axtel

Click HERE to download a PDF copy of the Boston Terrier Standard. 

Click HERE to download a PDF copy of the BTCA Illustrated Standard. 

Click HERE to visit the AKC site to learn more about the Boston Terrier and download the standard from their website.