Issues : Omission of current key accidentals

b. 26

composition: Op. 28 No. 17, Prelude in A♭ major

..

On the last quaver in A (→FCGE1) there are no accidentals before the middle notes of the chords in both hands – a  before b1 and a  before d2. The patent inaccuracies were corrected in FE (only the ) and EE (both). In turn, in GE2 (→GE3) naturals were wrongly added before both notes.
(NB: both correct accidentals are present in FCI.) 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Omission of current key accidentals , FE revisions , Inaccuracies in A , Errors repeated in GE , Errors repeated in FE

b. 27

composition: Op. 43, Tarantella

..

In A and GE1 (→GE2GE3) there is no  lowering to g in the LH part.

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals

b. 27

composition: Op. 10 No 12, Etude in C minor

..

In A there is no  raising a2 to a2. This patent error was corrected in FE (→GE,EE).

category imprint: Differences between sources

issues: Omission of current key accidentals , Errors of A

b. 27-30

composition: Op. 25 No 11, Etude in A minor

..

In the passages including a few octaves, there are no accidentals in the sources, which, however, does not raise doubts concerning the text intended by Chopin.

In GC there are no sharps needed in the notation of f1f2 in bar 27, ff1f2 in bar 28, f2f1 (L.H.), c1 in bar 29 and fd2 in bar 30.
In FE the same signs apart from the sharps before f1 in bar 27 and f1 (L.H.) in bar 29 were omitted; moreover, the  raising d2 to d2 in bar 29 was overlooked.
GE1 completed the signs overlooked in GC except for the  raising f1 to f1 in the L.H. in bar 29.
In the remaining editions – EE and GE2 (→GE3) – all necessary signs were added.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Errors of GC

b. 27

composition: Op. 28 No. 24, Prelude in D minor

..

A is missing the  raising b1 to b1. The patent inaccuracy was corrected both in FC (→GE) and FE (→EE).

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals , Errors of A , FE revisions , Fontana's revisions