Chât pha, gesso, phụ tùng CHẤT PHA
Tác dụng là làm lỏng, làm nhuyễn. Có 2 loại:
– Chất pha nước: Chất dùng an toàn nhất là loại đã đước pha sẵn. Nhưng ta vẫn có thể pha lấy: 1/3 nhựa thông + 1/3 dầu lanh + 1/3 vécni demar. Khả năng gắn kết, làm dẻo của nhựa thông khi dùng riêng, không có kết quả nảy. Nếu chỉ dùng dầu lanh thì màu sẽ mau bị ố vàng.
– Chất pha đặc : bền, dễ sử dụng, độ dẻo có phần khác biệt. GESSO
Chất này dùng để sơn lót, chuẩn bị mặt vải vẽ. Xưa kia mỗi họa sĩ tự làm lấy, nay có loại gesso hỗn họp pha thêm nước trước khi tô phết lên mặt vải hoặc các panô ván, giấy bìa, bằng cọ bề ngang 8 – 10cm. Đừng bôi luôn một lớp dày, nên bôi lớp mỏng, nhiều lần. Đợi cho lớp trước khô, dùng giấy nhám mỏng đánh phẳng mặt. PHỤ TÙNG LINH TINH
– Khăn vải: Có độ thấm nước cao để chùi cọ, hoặc khăn giấy
– Dao trét màu và dao cạo sơn
– Dung môl : Nhựa thông, dầu sơn, dầu khoáng để rửa màu.
Xem sau đây cách thực hiện dụng cụ rửa cọ bằng 2 ống lon: dùng đinh đục nhiều lỗ nhỏ vào đáy ông lon nhỏ, lật ngược lại đặt trong ống lớn. Chế dầu thông hoặc dầu rửa sơn vào ống lớn.
Khi ta rửa cọ màu bẩn sẽ rơi xuống đáy ống con, không lan ra ngoài, giúp ta giữ dung môi được sạch lâu hơn.
Sau buổi làm việc, rửa cọ bằng dung môi rồi rửa thêm bằng nước xà phòng trước khi cất.
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