Ceann de na coimhiotail is luaithe da raibh in usaid ag daoine is ea cre-umha . Cuid amhain stain le dha chuid copair ata ann.
Crua is frithsheasmhach i gcoinne creimthe. De reir nois usaidtear e i dteilgean clog , agus is e an t-abhar is coitianta i n dealbhoireacht mhiotail. Ar dtus ullmhaionn an dealbhoir samhail i gcre, adhmad no abhar cui eile.
Ansin deanann se claonmhunla bosca in dha leath le meascan gainimh is marla (ata teasdionach), baineann an tsamhail as an munla, agus doirteann an cre-umha leaite isteach sa mhunla. Fuarthas go raibh dealbhoireacht mhaisithe ar chaighdean ard a deanamh sa tSin sa 16u cead RC. [1]