Reagent Application

Reagent Application is the administered introduction of a measured reagent to a prepared surface, vessel, or ledger leaf, performed under the standing authority of the Office of Acquisitions & Stasis and recorded in the applying office's reagent register. It is distinguished from mere spillage, from dampening, and from the wholly separate axiomatic procedures by the presence of three things: a requisition, a witness, and a line in a register. Where any of the three is absent, the Tower records the event as an accident and not as an application, with consequences for liability that the Tenth Concordance has twice failed to clarify.

Origin and the Reagent Schedule

Reagent Application was not, in its earliest form, a regulated act. The Third Concordance, Annex 7, Clause 22, registers Silent Moss as a "Controlled Atmospheric Reagent" and fixes nothing further about its use — a brevity that the Functionalist School has cited for nine decades as evidence that the Concordances were meant to be read as inventories rather than as instructions. The Office of Acquisitions & Stasis did not accept this reading. Beginning in the winter of the year recorded as 4,112 by the office's own count, it issued the Reagent Schedule, a numbered list of permitted applications by reagent, surface, and hour, and required that every application be entered against a schedule line before the reagent left the vault.

The Schedule has been amended two hundred and six times. It has been reprinted eleven times. The eleventh printing omitted the whole of Part C, relating to applications upon parchment, and was in circulation for four months before anyone noticed, during which time some three hundred applications proceeded under a Part C that did not exist on the page but existed, by the doctrine of continuance, in the register. These applications were subsequently regularised by the Eleventh Rectification, which is itself now cited more often than the Part it restored.

Procedure and the Witness Requirement

An application proceeds from requisition to entry in four movements: the drawing of the reagent against a schedule line; the preparation of the surface, which for photosensitive papers follows the requirements of the Tenth Concordance, Annex D; the application proper, made by the requisitioner in the presence of a witness of the second grade or above; and the entry, made in iron-gall ink within the same hour. The witness does not assist. The witness attests that the reagent was applied to the surface named in the requisition and not to another.

This last distinction has a history. In the matter of the Affair of the Fourth Landing, a requisitioner applied a full ampoule of reagent to a leaf adjacent to the one specified, on the grounds that the leaves were identical and the register would not know the difference. The register did know the difference, because the witness had written the correct leaf number and the reagent had not been applied to it. The witness was commended. The requisitioner was reassigned to the Stairwell of Minor Corrections and is remembered in the Schedule's marginalia only as "the applicant of the fourth landing," a designation that has since attached to the landing itself.

The witness requirement does not apply to applications made below the ninth gallery, where no second-grade witness is stationed and the entry is countersigned instead by the vault clerk on duty. Vault clerks are instructed not to converse with applicants during countersignature. This rule was introduced after the Winter of the Long Register, when a countersigning clerk and an applicant fell into a discussion of the Schedule's numbering that lasted, by the register's own timestamps, until the following spring.

Reagent Formulations and the Ampoule Count

The formulations available for application are fixed by GSFM-Δ-7, which specifies the inks and reagents for which the Office maintains ampoules and sets the count at seven. The Functionalist School objects that the count of seven is itself a formulation and ought therefore to appear in GSFM-Δ-7 as an eighth entry, a position the Office has declined to entertain on the ground that an entry cannot count itself. The dispute is now in its fourth decade and has generated a literature larger than the Schedule it concerns.

Where a formulation is not among the seven, the Office permits its application only under an application for a provisional reagent, which must be renewed at each gallery crossing and lapses if the applicant is absent from the vault for more than a shift. Provisional reagents are stored in the annexe and are not to be carried on the open stairs.

The Contradiction of Annex Δ

Clause 3 establishes the framework under which applications may be recognised after the fact, and its Annex Δ formally documented Retroactive Contamination in terms that plainly contemplate the contamination of applied reagents. The Tenth Concordance, Annex D, meanwhile, requires that all ledgers for SC-44 materials be kept on photosensitive reagent paper — a surface which, by its nature, records every application made to it, including the application of the entry describing that application. The two instruments cannot both be satisfied where an application is retroactively recognised, since the paper will show an application at an hour when the Schedule records none.

The Office's working resolution, set out in a marginal note of the vault clerk Perpetua Vane and never formally adopted, is that the paper's own record is to be treated as an application of the second kind and filed separately. Vane's note observes that "the leaf does not lie, but it does not testify" (Vane, Marginalia on the Reagent Schedule, f. 44r). The Wing of Recursive Application has declined to rule on the question, referring it onward in a petition that remains, by the Wing's own admission, open.

Current Inventory

The annexe holds, at the date of this entry, the following stocks available for application:

• Four ampoules of the iron-gall formulation, GSFM-Δ-7, entry 1;
• Two ampoules of the photosensitive preparation, entry 3, one of which is reserved to the Mirror service;
• One ampoule of the moss distillate, entry 6, held under Clause 22 and drawn only with the countersignature of the vault clerk;
• Eleven provisional reagents, unnumbered, of which four are of uncertain provenance and are marked for disposal.

The seventh ampoule of entry 6 has been empty since the Winter of the Long Register and is retained on the shelf, per the Schedule, so that the count of seven remains visible to the eye.