Table 2.

Sampling sites and type of alteration

Sample number	Sampling area	Sampling site	Type of alteration	Type of material	Salinity levelB	pH of the sample	AnalysisA
B1	former Auschwitz II-Birkenau concentration and extermination camp in Brzezinka	floor; barrack B-124	Bulging, crumbling, cracking weak efflorescence	brick	low	7.36	C/NC/S
B2		partition wall, height from the ground 10 cm; barrack B-124	Bulging, crumbling, cracking	brick	medium	7.02	C/S
B3		partition wall, height from the ground 50 cm; barrack B-124	Bulging, crumbling, cracking	brick	medium	7.33	C/NC/S
B4		partition wall, height from the ground 50 cm; barrack B-138	Bulging, crumbling, cracking, weak efflorescence	brick	low	7.33	C/S
B5		external wall, height from the ground 50 cm; object B-150	Very strong efflorescence, cracking, detachment	brick	high	8.75	C/S
P1	19th century historic building in Lodz	internal, eastern load-bearing wall, height from the ground 150 cm	Strong efflorescence, cracking, detachment	paint-coated plaster	high	7.55	C/NC/S
P2		internal, eastern load-bearing wall, height from the ground 100 cm	Strong efflorescence, cracking, detachment	paint-coated plaster	medium	7.36	C/S
P3		internal, eastern partition wall, height from the ground 80 cm	Strong efflorescence, cracking, detachment	paint-coated plaster	medium	7.35	C/S
P4		internal, eastern partition wall, height from the ground 100 cm	Very strong efflorescence, powdering	paint-coated plaster	high	7.13	C/S
B6		external, western wall, height from the ground 50 cm	Strong efflorescence, detachment	brick	high	9.75	C/NC/S
B7		external, northern wall, height from the ground 80 cm	Very strong efflorescence, detachment	brick	medium	9.25	C/S

^AType of analysis: C—culture-dependent analysis (16S rRNA gene sequencing); NC—culture-independent analysis (clone library construction); S—SEM/EDS analysis

^Bsalinity level according WTA (45) included in Table 1