Symbols for techniques used in printed ex-libris
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Code
Annotations                 
Intaglio techniques (original)
C
Intaglio printing (blank); embossing (Chalcographia)
C1
Steel engraving
C2
Burin (graven or gouge) engraving, notably on copper
C3
Echting
C4
Drypoint
C5
Aquatint
C6
Soft-ground or other ground-based echting
C7
Mezzotint
C8
Intaglio engraving on linoleum, plastic & other materilas
Intaglio techniques (reproductive)
P3
Heliogravure (manual line and tone photogravure), Photogalvanography
P4
Commercial photogravure, rotogravure
P10
Echted steel printing (die-printing)
Relief techniques (original)
X
Relief printing (blank)
X1
Woodcut
X2
Woodcut engraving
X3
Linocut
X4
Relief-printed engraving or echted metal plates, notably metal cut
X5
Relief-printed metal plates created for intaglio printing
X6
Relief-printed engraving of other materials, for example synthetic ones
X7
(chinese) stone stamp
Relief techniques (reproductive)
T
Typography, letterpress
T1
Linotype, indirect letterpress
T2
Photoxylography, facsimile wood engraving
T3
Commercial rubber stamp
P1
Line block (cliché) with or without photography
P2
Half-tone, for example photozincography
Flatbed, stencil, electronic techniques (original)
L1
Autolythography
L2
Autography (transfer lithography)
L3
Zincography
L4
Algraphy
P8
Original photograph, hologram
S
Stencil, "pochoir"
S1
Original serigraphy (screenprinting)
S2
Mimeography (dye stencil)
S3
Katazome (oiled-paper stencil)
S4
Kappa (Katazome made with persimmon juice)
CGD
Computer generated desing
Flatbed, stencil, electronic techniques (reproductive)
P
Photographic reproduction
P5
Collotype
P6
Photolitography, process transfer lithography
P7
Offset
P9
Serigraphic reproduction (photosilkscreen)
CRD
Computer reproduced design
Y
Photocopy
Others symbols
U
Technique not listed above, including Frottage, Chinese rubbing and collography
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Number after the technical symbols = number of passages throuth the press
/mon.
Monotype
/ col.
Hand-coloured
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