Because some dye might not stick to the materials or work on the materials of the cloths or if you have a budget of $10 and cant go over but you spend $9 on sloths and the dye cost $2.50 then you would of gone over budget.
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Rain cloud prolly cus it's a natural shape that can shape up into a heart, Star, Circle or any irregular pattern/shape.
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It could add a more intereasting point of veiw.
Explanation:
Thats all I got sorry
Fresco Secco. In the dry plaster or "fresco secco" technique, pigments are usually mixed with water, although other substances might also be used. The paint is then applied to a dry plaster wall which has been wetted down with water.