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b. 31

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

..

In A (→FE) there is no  before the 2nd note on the 3rd beat in the bar (f) nor a  before the 2nd note on the 4th beat (a), which was corrected in GE. In EE the missing accidentals were gradually added:  in EE3 in EE4.

In GE1 the  before the 1st note in the L.H. (F1) was omitted.  

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Errors in GE , GE revisions

b. 31

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

..

A has an unnecessary  before cbefore the chord on the 4th beat in the bar, yet it does not have the necessary  raising f1 to f1. In FE the chord was left without any accidental, which was corrected in EE3. The additions were also performed in GE1 (→GE2), in which the accidentals are placed before each note. In GE3 (→GE4) three upper accidentals were removed, therefore, also the necessary  before f1. An unnecessary revision was also performed in EE4, adding a  before c2

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Accidentals in different octaves , Errors in GE , GE revisions , Cautionary accidentals

b. 32

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

..

In A (→FE) there is no  raising to G. The mistake was corrected in GE and EE. At the end of the bar in GE3 (→GE4) the  before the lower note of the octave in the R.H. was omitted. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Errors in GE , GE revisions

b. 34

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

Octave in A

Chord in FE (→GE,EE

..

The octave in A is the original version, changed by Chopin in a proofreading of FE (→GE,EE). In FE the correction was inaccurately performed – there are no dots extending the added notes, while the  (cautionary) was placed at the pitch of b2. The rhythmic error was corrected in GE and EE and the  was moved before a2 in GE1, yet removed in EE and subsequent GE,s. 

category imprint: Differences between sources; Corrections & alterations

issues: EE revisions , Errors in FE , GE revisions , Cautionary accidentals , Rhythmic errors , Authentic corrections of FE

b. 34

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

..

In A the accidentals are before each note of the chord at the beginning of the bar. In FE (→GE1,EE) the  before awas omitted. The accidental was added in GE2 (→GE3GE4).

category imprint: Differences between sources

issues: Inaccuracies in FE , GE revisions , Cautionary accidentals