In this work we try to understand some optical properties of blazars having uncertain types (BZU) in BZCAT vs. 5 Catalogue. Cross-correlation with SDSS reveals 43 BZU out of 227 that have spectra in SDSS. We have carried out spectral reclassification for these 43 blazar candidates (BZU) for activity types. As a result, 37 (86%) objects out of 43 changed their previous type.
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