Dearest Madame Evangeline- Chief Archivist, The Esteemed Library of London,

Professor Eldrin Nightshade here, penning this missive with a quill that trembles slightly, perhaps from residual atmospheric instability, or perhaps from the sheer weight of my profound mortification. I write to you, Madame Quill, regarding a most unfortunate, entirely unforeseen, and frankly, rather embarrassing incident concerning a recent delivery of my Anti-Gravi-Tea.

It has come to my attention (via several rather distressed pigeons carrying a telegram that spontaneously unfolded into a banner reading "Gravity IS a Law, Nightshade!") that upon the arrival of your tea, a localized, indeed, highly focused, gravity anomaly occurred within the hallowed confines of your magnificent library. My deepest apologies for the temporary disarray this may have caused, especially within your cherished History Book Section.

I understand that seeing millennia of meticulously documented human endeavor (from the Annals of Ancient Pottery to the Compendium of Victorian Sock Darners) suddenly engage in an unscheduled, brief levitation was... unexpected. And the faint, echoing giggles that were reportedly heard emanating from a certain Grimmoire (a tome I recall you were most protective of) were, I assure you, entirely unintentional and undoubtedly disconcerting. My current hypothesis suggests a slight over-calibration of the tea's subtle 'buoyancy particles' reacting perhaps, with the immense, unseen weight of historical narrative. A fascinating, if regrettable, scientific observation.

Please believe me when I say that such aerial displays were never the intended effect of the Anti-Gravi-Tea. Its true purpose is merely to bestow a lightness of spirit and an elevated perspective, not to defy the very laws of Newtonian physics within public institutions. My calculations were, shall we say, optimistic.

As a profound gesture of my sincerest apologies, and in an attempt to literally and figuratively 'ground' the situation, I would be honored to send to the esteemed staff of the Library of London a generous crate of our newly formulated "Terra Firma Blend" Coffee. It's a robust, earthy brew designed to anchor the spirit, focus the mind, and quite decisively, keep one's feet firmly planted upon the ground, regardless of any lingering atmospheric whims. Consider it a small token of gratitude for your continued (and remarkably patient) patronage, and a subtle counter-agent to any lingering levity.

I trust this unforeseen display of incidental enchantment has not unduly dampened your magnificent spirit, nor your faith in my less overtly chaotic concoctions.

Awaiting your understanding, and with deepest regrets for the momentary suspension of your historical narratives,

Yours in the pursuit of recalibrated gravity and reliable deliveries,

Professor Eldrin Nightshade Alchemist & Proprietor, The Seventh Atelier