When a maker attempts to duplicate an antique type instrument without also duplicating this behavior, the results are a waste of time and money, in my estimation. This is because the principal musical behavior, to which a sensitive musician naturally responds when making music, on such an instrument is absent. Nothing else can replace that effect. One can't play around with a flat sounding instrument to make it have a blooming effect when the bloom is missing. Anyone who is interested in learning more about bloom will have to wait until my book comes out, or they can do what I did and pay very close attention to every aspect and detail of the behavior of sound until they fully understand what they are observing.
Bloom is a purely objective feature in an instrument's sound.
It is either present or it is not. Bloom is the effect or behavior of the sound's appearing to swell or grow as it decays after the beginning of the sound. The following is a graph of what this behavior might look like. You can notice, upon release of the string from the plectrum on a harpsichord or after the moment of strike on a piano, the primary bloom, which is an explosion of sound. That sound is composed of all the partials plus the fundamental.