Expressions of limited knowledge (que yo sepa)

QuestionAnswer
canvas
el lienzo
As far as I know, this canvas is old.
Que yo sepa, este lienzo es viejo.
forger
el falsificador
to imitate
imitar
The forger imitated the colors, as far as I know.
El falsificador imitó los colores, que yo sepa.
to attribute
atribuir
brushstroke
la pincelada
As far as I know, they attribute this brushstroke to the painter.
Que yo sepa, atribuyen esta pincelada al pintor.
expert appraiser
el perito
forgery
la falsificación
The appraiser attributed the forgery to that museum, as far as I know.
El perito atribuyó la falsificación a ese museo, que yo sepa.
genuine
genuino
This is a genuine brushstroke, as far as I know.
Esta es una pincelada genuina, que yo sepa.
to be certain / to be evident
constar
paintbrush (artist's)
el pincel
As far as I know for certain, he didn't use that paintbrush.
Que me conste, él no usó ese pincel.
As far as I know for certain, they didn't imitate the signature.
Que me conste, no imitaron la firma.
Look at it; it is not the original canvas, as far as I know for certain.
Míralo; no es el lienzo original, que me conste.
Check it well; it is not very genuine, to say the least.
Revísalo bien; no es muy genuino que digamos.
provenance / origin (source or point of departure)
la procedencia
The provenance is not very clear, to say the least.
La procedencia no es muy clara que digamos.
The signature is not very authentic, to say the least.
La firma no es muy auténtica que digamos.
The appraiser said that it was a forgery.
El perito dijo que era una falsificación.
One never knows with an intelligent forger.
Uno nunca sabe con un falsificador inteligente.
One cannot imitate this brushstroke.
Uno no puede imitar esta pincelada.
As far as I know, the provenance of this brush is authentic.
Que yo sepa, la procedencia de este pincel es auténtica.