This was done in order to find out how heavy the dirt layers are, how strong these are attached to the painting surface, as well as to be able to calculate time for this part of the conservation. The methods used was on the one hand by cleaning off heavy layers of dust on the other dry cleaning by akabad sponge. A third cleaning technique accomplished by distiled water mixed with a slight amount of solution has to be done in order to get rid of heavier dirt stuck to the murals.
The restorer Carmen Deas clean off dust layers built up since the 12th century with a brush made
by badger hair on the eastern mural in the northern aisle that made the figures and the colours in
The whole exterior and interior of the church and the royal palace including all architectural details was measured by laser measuring in order to establish ground plans, cross-sections and 3D drawings (CAD), so called axonometric drawings.
The architect Tadesse Girmay transfering laser measuring data in CAD software after conducted